Ok.

My first .deb so watch out, it might explode your phone and ruin your life.

Right mouse button added - hold shift (you need live embers powerup for this to work) and tap to load. Releasing shift before stylus allows for cheat - preloaded live embers charge (doesn't stop you from using the LMB powerup). Takes a bit getting used to releasing shift and stylus, if someone has better idea of implementing it please do: player.cpp lines 250+

Slowdowns in levels 3+ seem to be caused by "L4D AI Director" spawning lots of minions. Seems to get back to normal once they're gone. Fullscreen set to on, so use ctrl+backspace to quit.