Because of server performance problems lately, I've started caching the pulldown lists under the comics. I've noticed a pretty huge performance increase already.

Everything should be fine, but let me know if your comic list falls out of sync with your comics (after making/editing or deleting comics.) Or any other weird side-effects.

So far so good. I edited one comic that had no set affiliations, then I edited another comic that belonged to two sets. The results were the same: comic edited, nothing in any sets disturbed, nothing in regular comic view disturbed.