Use cursor:position-changed to make sure cursor never gets to end of line in command mode.

The exception being an empty line.

src/atom/vim-mode.coffee

@@ -13,7 +13,7 @@ class VimMode
     requireStylesheet 'vim-mode.css'
 
     @opStack = []
-    @editor.addClass('command-mode')
+    @activateCommandMode()
 
     atom.bindKeys '.editor', '<esc>': 'activate-command-mode'
     @editor.on 'activate-command-mode', => @activateCommandMode()
@@ -70,6 +70,11 @@ class VimMode
     @editor.removeClass('insert-mode')
     @editor.addClass('command-mode')
 
+    @editor.on 'cursor:position-changed', =>
+      moveCursorBeforeNewline = not @editor.selection.modifyingSelection and @editor.cursor.isOnEOL() and @editor.getCurrentLine().length > 0
+      if moveCursorBeforeNewline
+        @editor.setCursorColumn(@editor.getCurrentLine().length - 1)
+
   numericPrefix: (e) ->
     num = parseInt(e.keyEvent.keystroke)
     if @topOperator() instanceof operators.NumericPrefix

src/atom/vim-mode/commands.coffee

@@ -4,10 +4,7 @@ class Command
 
 class DeleteRight extends Command
   execute: ->
-    @editor.delete()
-    isOnEOL = @editor.getCursorColumn() == @editor.getCurrentLine().length
-    if isOnEOL
-      @editor.setCursorColumn(@editor.getCursorColumn() - 1)
+    @editor.delete() unless @editor.getCurrentLine().length == 0
 
 module.exports = { DeleteRight }
 

src/atom/vim-mode/motions.coffee

@@ -17,8 +17,7 @@ class MoveLeft extends Motion
 class MoveRight extends Motion
   execute: ->
     {column, row} = @editor.getCursorPosition()
-    isOnLastCharachter = @editor.getCursorColumn() == @editor.getCurrentLine().length - 1
-    @editor.moveCursorRight() unless isOnLastCharachter
+    @editor.moveCursorRight()
 
 class MoveUp extends Motion
   execute: ->