Well, I just went through the horror of trying to do the t-modling with a dremel and the carbide bit mentioned above. Its a nice little bit...but not up to the task of forming a new groove in 20-30 feet of melamine (particle board).
First of all, I went through 2 of those $17 bits...and still didn't finish the cab. In fact, I was only about half way through. So I had to take a straight cutter and go carefully down the sides and make an even bigger groove, and use polyurethane glue to hold the t-molding in.
Well, after the glue foamed out of every seem, and the hours it took to clean that stuff off (awesome glue - sucks to clean out of t-molding grooves though), I was frustrated.
The t-molding looks great and is held in *very* tightly by the glue, but I DO NOT recommend this method. Oh yeah, I burned up two of the good craftsman rotary tools in the process. Fortunately, they are cool on the returns.
In all, with the price I spent on the router attachment kit for the rotary, and the two bits, I could have purchased a cheap craftsman router and the 3/32 wood bit from MLCS.
FWIW, I just received the 3/32 bit from MLCS today ($18 shipped) and will buy a router here in the near future for the 3rd cab. That t-molding experience completely sucked.