Will this spec work to be a primary / secondary tank in 5 man groups (Scholo, strath, BRD, LBRS, DM) and as secondary tank in 15 man UBRS runs?

Feral:
Ferocity 5
Feral Instinct 5
Brutal Impact 2
Thick Hide 5
Feral Charge 1
Sharpend Claws 3
Predatory Strikes 3
Primal Fury 2
Savage Fury 2
Faerie Fire 1
HotW 5
LotP 1

Resto
ImotW 5
Furor 5
Nature's Focus 4
Improved Enrage 2

Unable to drop ImotW, as my guild currently has around 15 lvl 60's of which I am the only druid (need to keep for casting Gift on the raid). We have plenty of healers, so I have room to play as a feral on most of our instance runs. I currently do most of the raids in cat form, but am thinking I would be more helpful as an off-tank (only 2 lvl 60 warriors out of the 15 people and we are not short on DPS).

Have only been lvl 60 for maybe 2 weeks, so any advice would be welcome. Thanks in advance.

Seems like a well built talent tree to me and perfect for the role you are wanting to fill

Do you use enrage much I find myself never using it however as I have mentioned before I am a lowbie/newbie only lvl 20 druid.

I use it alot; enrage + frenzied regen and i can stay in bear most of the timewithout popping out to heal myself.