The other thing with cargo space (especially with changing the size-capacity ratio) is the chance that changing it will screw up balance for carriers etc.
I am thinking about some special missile types. Until I get better names, I'll 'borrow' David Weber's names.
1) AFHAWK
i fighter missile. Should be easy to
do.
2) SBMHAWK:warp-capable missiles (might need to model them as ships, which, if I recall, means they can't be cargo. Catch-22)
3) AMBAM. Anti-mine missiles (in the books they were described as low strength missiles with a large bLast radius, just enough to set off mines)