First, my saves has been deleting all by themselves and I can have really small number of them, how to solve this?

Second, is it possible to set jump on WheelUp WheelDown and Space at the same time? If it is, what's the command for this?

thanks in advance.

To increase the max number of saves just navigate to this file and open it up in a text editor:

Steam\steamapps\common\Amnesia The Dark Descent\config\game.cfg

Look for MaxAutoSaves = "20" and change that to however many saves you want.

Unfortunately, you can only have 2 inputs per command in the game. If you don't know how to change the secondary keybinds I made a guide of that here:

http://www.speedrun.com/amnesia/thread/kxwc9

I know how to set jump on WheelUp and WheelDown, and that's how I play. I'm asking about this, because in few places in game (for example jump in entrance cistern, jump above hole in choir) I prefer using space, because it's faster and working in more times, but I see that I can't do anything with this. Thanks for help with numbers of saves :D