Ah okay, then this makes sense for how it currently works. It currently does not know a difference between a backpack that was willingly dropped and one that was dropped due to death. In the case of death - typically people don't want other players to be able to loot PVE players, which is why PVP -> PVE and PVE -> PVE interactions wont let you loot the backpack. For the time being, if you want backpacks to be lootable, you would have to enable players to be able to loot PVE players.
In the next update I'm going to be expanding the granularity of what is protected/unprotected, perhaps I can include a section for backpacks so you can choose how you want backpacks to be handled specifically. Also, I'm going to be including fixes for a lot of your bug reports in the next update too, which is a big update so that's the reason why its taking some time (just so you know!).
As for the parachute, I'm not sure what's going on there - is it possibly within a building zone that belongs to someone else?
As for clans support, currently it just supports team members, but I'm considering support for clans as well.