Hi Alexx,
ZBrush uses key codes when identifying hotkeys. These can vary with different keyboards, so they won’t always correspond to what ZBrush thinks they are. It’s also possible that ZBrush will ignore certain keys. (For example, on the UK keyboard ZBrush thinks the @ key is the tilde. It won’t work as a hotkey because it’s used to pan the document in wrap mode.)
You can find out the code that ZBrush uses for a particular key by looking at the View Keyboard Status slider in the Preferences>Utilities sub-palette. (It’s the second slider from the top.) Clear it first so you know which slider it is - pressing the Spacebar should give a value of 32.
Don’t use Ctrl, Shift or Alt when looking at the slider. Those keys will just complicate things. If you want, you can add these modifier keys to a key by just adding their numbers to the value for the key:
Shift = 256
Ctrl = 512
Alt = 1024
Thanks for the tip about the Delete key. Very useful!
HTH,