Yes, don't worry too much about that. The Kad Feeder is networked, which means it syncs Kad main times and only refreshes between 1 and 1.5 seconds when it has to (like to check if Kads are hungry). It's safe. You can change the value if you want, but that will decrease your chance of actually feeding a Kad.
And use item DB option, it's perfect and I've already fed a bunch of Kads like that. 10k maximum should be fine - actually, the default settings are awesome. The only thing I change is like to only feed 2/3 Kads every time I run the program and then stop. You don't want to feed too many in a day or people might get suspicious.
Okay, great. Thanks