Ok, we had several instances of the heros using duranium shadows to fool sensors into detecting high number of weapons and warheads.

Wouldn't this be a good sci ability for tanks?

You make an enemy think that you got 5000 photon torpedos loaded and locked on his warp core, it surely warrants flagging you as a priority target and raise your threat level. So everything in short sensor range switches target to you.

That would give tanks a purpose for sci boffs beyond heals.

And in a related matter, you could add sci consoles:

1. Duranium signatur emitter to raise your threat level for tanks
2. Duranium damping field generator to hide your actual armaments and reduce threat level for dps/healers/controllers.

I wholeheartedly endorse this post - Threat management is sadly lacking right now, and would be extremely useful in STFs (and presumably other end-game content when it is introduced.)