In most text editors ctrl-arrow hotkey is used to walk through words (not a single symbol like just arrow key does). Similarly, Ctrl-Shift-arrow hotkey is used to select words (not single symbol). Actually, it is standart for graphical text editors and many peoples use this hotkeys, because they are very usefull.
In diffuse the same hotkeys (Ctrl-arrow and Ctrl-Shift-arrow) is used as merge commands.
As result of this issue, when I try to walk through text with usual hotkeys, I get unexpected merge actions.
I suggest to change hotkeys of merge actions. I think, that the simplest way is to change Ctrl to Alt in both cases.