Ooh never noticed (or thought of that) I have Rad (defense debuff) and if it does do double secondary effects then I may even stick more than one debuff enhancement in, diversity pays off! who wudda thunk it? 
PS anyone know for sure?
If that is the case! I think a sonic/* corruptor is on the cards!
Yeah I got a Sonic/Rad and so far its very cool like a regen blaster with some cool debuffs and buffs.
Wow! If it is true, it means I get criticals that clock double debuff on my DM scrapper!
Started a dark/dark corruptor yesterday, much fun, and I noticed that when I get a scourge hit, it reads as follows:
http://img498.imageshack.us/my.php?image=coh16nj.gif
Does this mean I get the accuracy debuff twice as well as the damage?