diff --git a/ui (gen4)/data.js b/ui (gen4)/data.js
index 1d5279a5..f23f9115 100755
--- a/ui (gen4)/data.js	
+++ b/ui (gen4)/data.js	
@@ -2091,6 +2091,7 @@ var DataPrototype = {
 	//
 	// XXX test more complex cases...
 	// XXX appears to be broken for joining sets via 'base' align...
+	// XXX appears not to join all the gid lists (tags)...
 	join: function(){
 		var args = Array.apply(null, arguments)
 		var align = typeof(args[0]) == typeof('str') ? args.splice(0, 1)[0] : 'base'
@@ -2148,6 +2149,23 @@ var DataPrototype = {
 
 				d += 1
 			}
+
+			// merge other stuff...
+			data.eachImageList(function(list, key, set){
+				if(set == 'ribbons'){
+					return
+				}
+
+				if(base[set] == null){
+					base[set] = {key: base.makeSparseImages(list)}
+
+				} else if(base[set][key] == null){
+					base[set][key] = base.makeSparseImages(list)
+
+				} else {
+					base[set][key] = base.makeSparseImages(base[set][key].concat(list))
+				}
+			})
 		})
 
 		// XXX this is slow-ish...
diff --git a/ui (gen4)/features/filesystem.js b/ui (gen4)/features/filesystem.js
index d6704587..bb90d635 100755
--- a/ui (gen4)/features/filesystem.js	
+++ b/ui (gen4)/features/filesystem.js	
@@ -44,6 +44,10 @@ var FileSystemLoaderActions = actions.Actions({
 		'index-dir': '.ImageGrid',
 
 		'image-file-pattern': '*+(jpg|jpeg|png|JPG|JPEG|PNG)',
+
+		// XXX if true and multiple indexes found, load only the first 
+		// 		without merging...
+		'load-first-index-only': false,
 	},
 
 	clone: [function(full){
@@ -151,7 +155,6 @@ var FileSystemLoaderActions = actions.Actions({
 							logger && logger.emit('merge index', k, res)
 
 							// merge...
-							// XXX this appears to lose bookmarks and other tags...
 							index.data.join(part.data)
 							index.images.join(part.images)
 						}
@@ -162,7 +165,9 @@ var FileSystemLoaderActions = actions.Actions({
 						// 		...we either need to lazy-load clustered indexes
 						// 		or merge, in both cases base_path should reflet
 						// 		the fact that we have multiple indexes...
-						break
+						if(that.config['load-first-index-only']){
+							break
+						}
 					}
 
 					logger && logger.emit('load index', index)
diff --git a/ui (gen4)/features/ui-slideshow.js b/ui (gen4)/features/ui-slideshow.js
index 149b63f9..297867f7 100755
--- a/ui (gen4)/features/ui-slideshow.js	
+++ b/ui (gen4)/features/ui-slideshow.js	
@@ -30,6 +30,9 @@ var _cmpTimes = function(a, b){
 
 /*********************************************************************/
 
+// NOTE: this uses ui-chrome-hidden workspace to set the initial state
+// 		of the slideshow workspace.
+//
 // XXX would be a good idea to add provision for a timer to indicate 
 // 		slideshow progress/status... 
 var SlideshowActions = actions.Actions({
@@ -240,7 +243,7 @@ var SlideshowActions = actions.Actions({
 						// NOTE: this is partially redundant with the 
 						// 		loadWorkspace.pre handler in the feature...
 						if(this.workspaces['slideshow'] == null){
-							this.toggleChrome('off')
+							this.loadWorkspace('ui-chrome-hidden') 
 							this.saveWorkspace('slideshow') 
 						}
 
@@ -339,7 +342,7 @@ module.Slideshow = core.ImageGridFeatures.Feature({
 			function(workspace){
 				if(workspace == 'slideshow' && this.workspaces['slideshow'] == null){
 					return function(){
-						this.toggleChrome('off')
+						this.loadWorkspace('ui-chrome-hidden') 
 						this.saveWorkspace('slideshow') 
 					}
 				}
diff --git a/ui (gen4)/features/ui-status.js b/ui (gen4)/features/ui-status.js
index 1da3d101..4494056b 100755
--- a/ui (gen4)/features/ui-status.js	
+++ b/ui (gen4)/features/ui-status.js	
@@ -492,6 +492,12 @@ module.StatusBar = core.ImageGridFeatures.Feature({
 			core.makeWorkspaceConfigLoader(
 				function(){ return Object.keys(StatusBar.config) },
 				function(workspace){
+					// XXX not sure about this protocol yet...
+					if(this.workspace == 'ui-chrome-hidden'){
+						this.toggleStatusBar('none')
+						return
+					}
+
 					'status-bar-mode' in workspace 
 						&& this.toggleStatusBar(workspace['status-bar-mode'])
 				})],
diff --git a/ui (gen4)/features/ui.js b/ui (gen4)/features/ui.js
index 51770049..844777d9 100755
--- a/ui (gen4)/features/ui.js	
+++ b/ui (gen4)/features/ui.js	
@@ -108,6 +108,13 @@ function updateImagePosition(actions, target){
 
 /*********************************************************************/
 
+// Workspaces:
+// 	ui-chrome-hidden		- all features handling chrome elements 
+// 								should hide all the chrome when this 
+// 								workspace loads.
+// 								NOTE: other workspace functionality 
+// 									should be handled without change.
+//
 // NOTE: this uses the base feature API but does not need it imported...
 //
 // XXX split this into read and write actions...
@@ -162,9 +169,6 @@ module.ViewerActions = actions.Actions({
 			'last',		// select last image
 		],
 		'ribbon-focus-mode': 'visual',
-
-
-		'chrome-visible': 'on',
 	},
 
 	// Images...
@@ -595,6 +599,7 @@ module.ViewerActions = actions.Actions({
 	shiftImageRight: [
 		function(target){ this.ribbons.placeImage(target, 1) }],
 
+	/*
 	// XXX how should these animate???
 	travelImageUp: [
 		function(){
@@ -602,6 +607,7 @@ module.ViewerActions = actions.Actions({
 	travelImageDown: [
 		function(){
 		}],
+	*/
 
 	shiftRibbonUp: [
 		function(target){
@@ -694,12 +700,6 @@ module.ViewerActions = actions.Actions({
 
 			this.reload()
 		}],
-
-
-	// toggle chrome on and off...
-	// XXX should this be here???
-	toggleChrome: ['Interface/Toggle chrome',
-		core.makeConfigToggler('chrome-visible', ['on', 'off'])],
 })
 
 var Viewer =
@@ -748,6 +748,11 @@ module.Viewer = core.ImageGridFeatures.Feature({
 
 					$(window).resize(this.__viewer_resize)
 				}
+
+				// setup basic workspaces...
+				if(this.workspaces['ui-chrome-hidden'] == null){
+					this.workspaces['ui-chrome-hidden'] = {}
+				}
 			}],
 		['stop', 
 			function(){