Pretty much have to agree with almost every post here... almost, not the ones that think this is a good idea.
Tac > everything else w/o boff powers
There is simply nothing a Sci or Engineer can do to a) out-damage a tacscort b) out-damage a tac-cruiser or c) stay alive longer than said escort or cruiser. I would put the order of superiority something like this:
How will anyone undo some Subnuke damage this way? Thats the nice thing about a Sci. The only way to get rid of Subnuke is Sciteam. But leaving a subnuke 30s on your debuff table will be too much of an advantage to Sci's.