I used to hate mudcrabs because every time someone went for a peaceful walk down the beach they had to seek out and destroy every slow-moving little fetcher before the battle music would turn off. By then the sun had usually set (vanilla timescale) and the mood faded.
Now I use a mod (
Trifle) that among other things lets me adjust battle music conditions. So my characters can stroll in peace, killing only the one crab that they want to eat and ignoring the others.
I find rats to be quite annoying. They’re too aggressive to ignore, not rewarding unless you like rat meat, and it’s embarrassing to miss when they’re jumping at you.