"as I recall you can't do Warp 10"

You can do a lot more than Warp 10 if you're a "Traveller" (from one of the better TNG episodes, I think it was titled something like "Where no man has gone before" -- is that original or what?), or with a "Trans-Warp Drive" like the one Janeway used to get partway home before she broke it, or with the space-folding "coaxial warp drive" that Tuvok gets (illegally) from the Sikarians, but they couldn't get it to work because they hadn't taken anti-neutrinos into account...
:O