LV wiring here not subject to code issues either. Wired my whole house about 5 years ago when building it. Speaking from experience, put in cat5 and cable to EVERY wall whether you think you need it or not. It's cheap and easy at the framed stage and you'll need it some day. Trust Me! I put in more than I thought I'd need and still wish I'd a run some extra to other walls now. DO IT!

OH Yeah - and wired my theatre room for 7.1 in-wall and in-ceiling speakers and will do it in every house from here on out.