Disabling pickpocketing while keeping the rest of the thievery functionality?

Hi. So the bards have the thievery button, but it greys out when hovering over a lock or a trap and only works for pickpocketing. I'm trying to figure out if it's possible to do the reverse - grey out thieving on characters while enabling thieving on locks and traps. Is this doable, and if so, how would I go about doing it? I know I can disable thieves putting points in the relevant skill, but that still allows them to make an attempt anyway. Also, how would I disable the steal button in shops? And finally, bit offtopic, are we able now to swap UI buttons (e.g. switch out guard for turn undead) or is that still hardcoded?