There are special stylus pens for capacitive touchscreens with a soft end, I would use one of those, I use it for my iPAD sometimes.
Ipad yes...
But touchscreen on a keyboard, no way, i dont have time to grab the pen everytime i need to make realtime changes. and my playing requires my 2 hands...
many people use stylus on the kronos because many of the items are so small, but just does not work for realtime changes... only for programming the thing before a performance...