Can anyone forsee any negative results of this?
Badly worded if you want some feedback regardless.
If you get no responses does it mean everybody believes there are no negative results or they can't be bothered to answer.
Anyway, can't you set sync depending on graphicsdepth()?
Afaik sync=1 is only a problem if you just miss a vertical blank and have to wait for the next. Whether this matters... I don't know you'd need to test.