Creating pressure is a so frustrating, since you have to sit and hold until you get too bord to continue. Being able toe edit pressure in the "properties" would be very usefull. Also to save pressure... Since some bombs can be more powerfull with a bit of pressure this will help a lot! If there is already a function like this please let me know.
I'm not totally certain why pressure isn't saved, but considering it's been practically a feature for as long as the game's been going, I don't see that changing anytime soon.
Even then, pressure is very easy to manipulate, and making it possible to save would remove the utility of many current machines and elements. :(