In BASH (Basic Action Super Heroes), you:

1. Roll 2d6
   
2. Doubles get an additional 1d6 and gets re-rolled if it matches.
   
3. Then the total is multiplied by a number (1-10).

Example: You have a multiplier of x3 and your initial roll of 2d6 is 2, 2.
Doubles: you roll another 1d6, and you get 2.
Match: you roll another 1d6 and get a 6.  You stop rolling because the 6 is not a match.

Total = 12 [2+2+2+6] x 3 = 36

Since the Target Number box is there, it could be used for the multiplier.

Doable?

That's actually pretty simple, will be in the next version.  Can test it on the beta site if you like, just beware all the visual oddities!  (c;