The McNair from what I understood was designated as a science vessel.  Being such I would imagine that if necessary between the engineer and science officer the two of them could modify any normal torpedo into what ever type would be needed whether it be to destroy a Borg ship or create a whole new planet such as the Genesis torpedo.<br/><br/>Putting that aside however I personally would think that having a cloaking device would make more sense on a science vessel.  (Yeah ok I just wanted Undiscovered Country  so the thought of cloaking devices is on my mind.)  One that they could fire their weapons through while cloaked.  Course if they cant be seen none of that would be really necessary but a very nice feature to have.<br/><br/>But yeah having a smaller ship does seem to limit what systems would actually be feasible.  Then again with twice the power and a smaller size the McNair would be extremely fast and maneuverable.  Which could very well be its greatest defense.<br/><br/>That's my two cents worth anyway.  *Grins*