If I may interject a thought here.... I am led to believe that the Shroud is actually something genetic with the Jem'HaDar as well.
I cannot remember the episode title...but Sisko and company had crashlanded on a planet where some Jem'HaDar were also marooned...along with their Vorta. There was a desperate shortage of Ketracell White among the Jem'HaDar, and of course, they were unable to control their urge for battle. And, if I remember correctly, a Jem'HaDar had stated that he could not shroud....I think that Shrouding is something that requires a great deal of concentration on the part of the soldier in question...and the lack of the White hampered such concentration considerably.
Just an opinion.
For the record, I think that you should go with whatever suits your game....whether it be technological or biological.
Respectfully,
General Chang
"So the Enterprise is on her maiden voyage, eh? Now that is one well endowed lady. Ah'd like to get mah hands on her ample nacelles, if ye'll pardon the bit o' engineerin' parlance." -Scotty, STAR TREK, 2009