Excellent addition! I love well thought-out auxiliaries.
I was a bit surprised by the under-dimensioned engines, as I assume they'd need to be strong to 'drag' rescued ships.
Absolutely, should be undergunned, if gunned at all. Not that familiar with Dropship, though a I'm dyed-in-the-wool vacchead, but 'never leave home without railguns' seems right out!

Doug