I still don't know how to include touch screen events (i made a thread a while ago and i'm a noob with UI modding) to the UI, so if anyone is bored and wants something to do with HTML, this is an idea. I'm sure a few people would like to test it out on a touchscreen PC or surface tablet, etc. Link
This probably doesn't help, or does it? A program to convert touchscreen events into mouse events. Are you trying to get it working with touch screens full stop, or add special controls to make touch screen more viable? http://www.lovesummertrue.com/touchmousepointer/en-us/index.html
Hmm that might be useful. And yeah PA would require some custom events anyway in order to be fun to play.