You can change them to whatever you like, but make sure you don't destroy your other ones. Check keymap.cfg and resetbinds.cfg in your config folder for information. To bind a key, use
bind KEY [command]
for example, bind S [backward]
Even better though, to change textures just hold Z or X and scroll (I forgot which one it was for wall textures - just try both, while looking at a wall).
edit: it's X for walls and Z for ceiling/floor.
bind KEY [command]
for example, bind S [backward]
Even better though, to change textures just hold Z or X and scroll (I forgot which one it was for wall textures - just try both, while looking at a wall).
edit: it's X for walls and Z for ceiling/floor.