Mmmh, it seems that it is not possible to use partial entries from the ships.tbl and use them in a modular table file. This means you can´t just copy and paste the entries for the shockwave, you have to copy the entries of the whole ship. Too bad, cause this means that you will override changes in the ships.tbl of mods, if you use the tbm. Nervertheless i will try to create a tbm with all capships and reduced shockwave speeds , so that everyone can decide to use it or not. If a modmaker do not change the original values of the vanilla FS2 ships, the tbm could be a perfect solution.
Check out on sunday.
But maybe there is someone out there (knock, knock WMcool), who can definetly say, that partial entries in tbm-files are possible or not.