Theiving Skills as Special Abilities

in IWD:EE Mods
The cleric thief has thief skills as a special ability. Is there a way to add that to other classes?
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So tell me: what skills are we talking about?
Edit: could you take a screen shot and post it?
All the neutral familiars, ferret, rabbit and cat are thieves - but with limited abilities. You can mod them to be good at everything. This way you can dispense with a thief class. But this is a major cheat.