IPs don't generally bother to be more than one-shot misbehavers, blanking pages or inserting rude comments. I simply revert and forget the matter.
On the other side, I've often seen admins/moderators go on a protecting/blocking rampage, without really thinking whether it's justified.
As for templates, their edits appear only in the recentchanges log, but not in the wikiactivity one. Most IPs do not notice them. I wouldn't worry.