Ah that's a shame, I have Sketchbook for raster symmetry so this was more me looking for a vector tool with symmetry.
I'm actually pretty amazed that none of the major vector packages seem to do symmetry well. I work in the film industry and spend a lot of time doing HUDs, UI and things like that where symmetry would literally save you half the time (plus it's just really good for getting that nice instant feedback when exploring shapes).
Fingers crossed it comes at some point in the future.