Thanks a lot for letting us know. Looks like you found a good bug! This has now been changed so that you cannot reset while group members remain in the instance.
Howdy, thanks for the report! Kept my afternoon more interesting than it might otherwise have been. Anyways, 1 and 2 will be fixed in the next build, as will 3. But 3 should already have been in, I had set up the creatures and their spawn rules, then forgot to add them. Doh! So you can look forward to increasing numbers of bosses each second wave when we next update... Hopefully that will prove more of a challenge! But if not, let us know and I'm sure we will do what we can to try and make sure you wipe at something, sometime, hopefully!
It's funny you mention that... I noticed this the other day and it confundled me too. It's changed now so you should only get the kills if you use that weapon in an attack that lands the killing blow.