diff --git a/ui (gen4)/lib/actions.js b/ui (gen4)/lib/actions.js
index 577f4f7d..13b9369e 100755
--- a/ui (gen4)/lib/actions.js	
+++ b/ui (gen4)/lib/actions.js	
@@ -530,7 +530,11 @@ module.MetaActions = {
 	// 		otherwise only mixin local actions...
 	//
 	// XXX test
-	mixin: function(from, all, all_attr_types){
+	mixin: function(from, all, descriptors, all_attr_types){
+		// defaults...
+		descriptors = descriptors || true
+		all_attr_types = all_attr_types || false
+
 		if(all){
 			var keys = []
 			for(var k in from){
@@ -542,9 +546,19 @@ module.MetaActions = {
 
 		var that = this
 		keys.forEach(function(k){
-			var attr = from[k]
-			if(all_attr_types || attr instanceof Action){
-				that[k] = attr
+			// properties....
+			var prop = Object.getOwnPropertyDescriptor(from, k)
+			if(descriptors && prop.get != null){
+				// NOTE: so as to be able to delete this on mixout...
+				prop.configurable = true
+				Object.defineProperty(that, k, prop)
+
+			// actions and other attributes...
+			} else {
+				var attr = from[k]
+				if(all_attr_types || attr instanceof Action){
+					that[k] = attr
+				}
 			}
 		})
 
@@ -569,6 +583,10 @@ module.MetaActions = {
 	// XXX not sure about these...
 	// XXX test
 	mixout: function(from, all, all_attr_types){
+		// defaults...
+		descriptors = descriptors || true
+		all_attr_types = all_attr_types || false
+
 		if(all){
 			var keys = []
 			for(var k in from){
@@ -581,11 +599,22 @@ module.MetaActions = {
 		var locals = Object.keys(this)
 		var that = this
 		keys.forEach(function(k){
-			var attr = from[k]
-			if((all_attr_types || attr instanceof Action) 
-					// remove only local attrs...
-					&& locals.indexOf(k) >= 0){
-				delete that[k]
+			var prop = Object.getOwnPropertyDescriptor(from, k)
+
+			// descriptor...
+			if(descriptors && prop.get != null){
+				if(prop.get === Object.getOwnPropertyDescriptor(that, k).get){
+					delete that[k]
+				}
+
+			// actions and other attrs...
+			} else {
+				var attr = from[k]
+				if((all_attr_types || attr instanceof Action) 
+						// remove only local attrs...
+						&& locals.indexOf(k) >= 0){
+					delete that[k]
+				}
 			}
 		})
 
diff --git a/ui (gen4)/ui.js b/ui (gen4)/ui.js
index bc41b25f..b9a9c01c 100755
--- a/ui (gen4)/ui.js	
+++ b/ui (gen4)/ui.js	
@@ -183,7 +183,7 @@ module.GLOBAL_KEYBOARD = {
 		
 		B: {
 			default: 'toggleBookmark',
-			ctrl: 'toggleTheme',
+			ctrl: 'toggleTheme!',
 		},
 	},
 }	
diff --git a/ui (gen4)/viewer.js b/ui (gen4)/viewer.js
index 40359f39..88f9d20c 100755
--- a/ui (gen4)/viewer.js	
+++ b/ui (gen4)/viewer.js	
@@ -1163,9 +1163,10 @@ var PartialRibbonsActions = actions.Actions({
 			var pl = this.ribbons.getImage(target).prevAll('.image:not(.clone)').length
 
 			// next/prev available...
-			var na = this.data.getImages(target, size/2, 'after').length - 1 
-			var pa = this.data.getImages(target, size/2, 'before').length - 1 
-
+			// NOTE: we subtract 1 to remove the current and make these 
+			// 		compatible with: nl, pl
+			var na = this.data.getImages(target, size, 'after').length - 1
+			var pa = this.data.getImages(target, size, 'before').length - 1
 
 			// do the update...
 			// loaded more than we need (crop?)...
@@ -1767,6 +1768,8 @@ module.GlobalStateIndicator = Feature({
 
 //---------------------------------------------------------------------
 
+// XXX should we rename this to "select"???
+
 // target can be:
 // 		'all'
 // 		'loaded'
@@ -1807,8 +1810,33 @@ function makeTagTogglerAction(tag){
 
 // XXX add image updater...
 var ImageMarkActions = actions.Actions({
+
+	// NOTE: this will return a copy...
+	get marked(){
+		if(this.data == null 
+				|| this.data.tags == null
+				|| !('selected' in this.data.tags)){
+			return []
+		}
+		return this.data.tags['selected'].slice()
+	},
+
+	// Common use-cases:
+	// 	Toggle mark on current image
+	// 	.toggleMark()
+	//
+	// 	Mark current ribbon
+	// 	.toggleMark('ribbon', 'on')
+	//
+	// 	Unmark all loaded images
+	// 	.toggleMark('loaded', 'off')
+	//
+	// 	Invert marks on current ribbon
+	// 	.toggleMark('ribbon')
+	//
 	toggleMark: ['Toggle image mark',
 		makeTagTogglerAction('selected')],
+	// XXX
 	toggleMarkBlock: ['Toggle block marks',
 		'A block is a set of adjacent images either marked on unmarked '
 			+'in the same way',
@@ -1848,12 +1876,27 @@ module.ImageMarks = Feature({
 	tag: 'image-marks',
 
 	actions: ImageMarkActions,
+
+	// XXX image update...
+	handlers: [
+	],
 })
 
 
 
 //---------------------------------------------------------------------
 var ImageBookmarkActions = actions.Actions({
+
+	// NOTE: this will return a copy...
+	get bookmarked(){
+		if(this.data == null 
+				|| this.data.tags == null
+				|| !('bookmark' in this.data.tags)){
+			return []
+		}
+		return this.data.tags['bookmark'].slice()
+	},
+
 	toggleBookmark: ['',
 		makeTagTogglerAction('bookmark')],
 	// action can be: