Is this a possibility?

The reason I ask is because 1-9 are used for each weapon slot such as slot1, slot2, etc. So whenever a menu is on screen, it prevents users from being able to switch weapons.
For example, the sm_admin menus, mapchooser vote menus, nominate menu or any other menus used by sourcemod all use slot1-0.
I get people all the time in my server who complain about this issue and it'd be nice to have the menus have an alternate set of keys that could be pressed that would free up those weapon slots.
Also, I know some games have a different set of key values for the number pad on the right side of a keyboard, such as kp_1, kp_2, etc instead of 1, 2, 3, etc. If Function keys could not be used, could the key pad be used for those games that support the separate keys?
I am aware of the old style menus where you hit escape to see the menu, but that menu system sucks.