No, wall hugging shouldn't be too hard. If you want advice on how a script like that would work, just ask on the scripting forum. Or maybe here is better, I don't know.

Lots of things you'll find in AUMs. For example, they have a Splinter Cell light-meter, which may come in handy, alarm code, etc. Ladder/rope climbing as well. Lots of useful things. Third-person camera scripts will be easy to find, I think, as well as being in the AUMs.

Good luck!