You can create a keyboard shortcut to a function using Edit -> Keyboard Shortcuts ( down bottom of the menu)
There are more functions than keys, most keys are already taken. Disabled just means not assigned. Easy enough to change, including those already taken. You might (will) get a warning that the key is taken but you can change (re-assign) anyway.
For the functions you want I would narrow the choice down using the search facility top of the dialogue.
Something like this: screenshot https://i.imgur.com/s195lHp.jpg
Which keys to choose? Any you like. Gimp will indicate if it is not possible - function keys for example. For a simple sequence A - S - D is convenient. I would avoid the bottom qwerty line z, x, c sometimes useful.
You might find that 'auto-equalize' and color-enhance' often not much use. Remember ctrl-z (undo) is your friend.
There are more functions than keys, most keys are already taken. Disabled just means not assigned. Easy enough to change, including those already taken. You might (will) get a warning that the key is taken but you can change (re-assign) anyway.
For the functions you want I would narrow the choice down using the search facility top of the dialogue.
Something like this: screenshot https://i.imgur.com/s195lHp.jpg
Which keys to choose? Any you like. Gimp will indicate if it is not possible - function keys for example. For a simple sequence A - S - D is convenient. I would avoid the bottom qwerty line z, x, c sometimes useful.
You might find that 'auto-equalize' and color-enhance' often not much use. Remember ctrl-z (undo) is your friend.