Oh, this is better than I hoped.
So….I can safely just create 29.97 fps timelines and let FCP X do the rest for me? imagine I’ll get tons of render files I’ll want to periodically clear out while editing (and then let the computer re-render) for things I try out but don’t use. Given the fact it’s actually 24p with pulldown, this also means it’ll be OK to use proxy files, later convert them to optimized files when the project is complete, and not have to worry about weird timeline things happening?
(Most importantly, thanks Doug!)