It would be useful to have a "do nothing/stand still" button in combat. For now if i wish to stand and wait for zombies I have to use change weapon option, which gets boring :)
If there is no such option because it wouldn't spend SP, you could still put it there and make it spend SP (because the survivor is nervous and fidgety so it still tires him/her :) )
Nice game with a definite feel of a zombie apocalypse :)
The SP regeneration seems to work fine this way.
Only thing I don't understand is why do I expend a big shovel while cleaning a room in my safehouse? What am I doing with it? :)