For combat logging I know the devs. have stated that they already have a system in place, it just isn't turned on in the alpha.
As for server hoppers, I don't know if they have a solution although I recall Dean mentioning something like a timer to join a server after logging out of a server, which would increase exponentially with every new server change. I do like your idea though, as it would not only stop those trying to get loot, but also those trying to ghost behind players (at least in towns). Ghosting: Get shot at by sniper on roof, exit server A, join server B, Climb onto roof where sniper was in server A, exit server B, join server A, shoot Sniper in the back.

I will attach the dxdiag and files tonight, I had thought they were unrelated but as it occured again I would like to add that it seems to happen after the whole "global chat" bug happens. Twice I have had this issue and both times I hear someone in global chat right before it crashes with this error.
Thanks for your help.

Update: Attached dayz app info and dxdiag info, I hope .Zip is ok, I don't have winrar. Have not had the issue since reporting.

I'm having this issue as well. I now have a screw driver in my hand and a can of spaghetti in my inventory and I can't open the can. Can screw drivers be used to open cans, I thought so.

Happens to me too, in several buildings.