I use mine shouldered w/ a tank, I like it much better. Partly because it feels more natural to me now and similar to my speedball setup.
The double trigger is not going to be fast like the Mini's or other speedball guns. The clip spring is very "spongy". There is a mod for using a Violent Series double trigger and a magnet return, that works just like the Mini's/speedball. It's posted on the BT Warriors web site here.
I don't think BT has released a TM ready rip-clip (yet) just the adapter. The issue w/ the standard RC is that it is not sensitive enough for the TM-15 or the TM-7 w/ a standard (ported) barrel.