Unable to bind to mouse buttons

[ShiftSad]

Lorien version:

release v0.6.0

OS/device including version:

Windows

Issue description:

Nothing happened, I should have been able to bind brush to mouse button 5

Steps to reproduce:
Go to the settings, then keybinds. Chose something then try to use special mouse buttons, such as back and forward

[ZwFink]

+1, Would also like to have the ability to bind mouse buttons.

[devpartap]

+1, Yeah i would like to use my side buttons as UNDO and REDO while sketching.