when i say that i do it all the time,  most days.  what i mean is i have an AEKII and an ADB mouse plugged into that.  and that is what i hot plug often.  I don't have any other adb devices...   but one thing I can say is I will continue to hot plug with out any worry what so ever...  I have replaced ADB fuses on customers boards before.  Not sure what they were doing but it was enough to blow the fuse.