I think it would be cool to have the option of a death penalty in PvP matches.
Like a rare chance of losing any piece of gear for dying that the opposing team can loot.
of course you'd need two "difficulty" settings then for PvP to keep casual playing viable.
But nothing should be save. not even bound and unique items.
Non STF people would have a valid chance to get STF gear that way or Klingons could steal some Pengs back...
Winning it in PvP would be a very prestigious thing i believe.
And it would give people a reason to replay STFs more at the same time to get they precious Borg shield back if they are so unlucky to lose it.
Better keep a spare in your inventory then.
Also everything in your inventory could also be looted of course as well as a percentage of your credits.