I was wondering though, do zero-offset forks change how you do backwheel tricks ( this is for future reference, I am not buying forks right now). I wouldn't think so but I haven't run those on my bike. Also, I know it helps to have your seat high for some front wheel tricks, is it the same for back wheel tricks as well?
As far as 0 offset forks go,the only difference that will make is your wheelbase will be even shorter...depending on your stems reach it may make it easier to pull up on the front end of the bike.
As for the seat height question.For backward steamrollers I like the seat a bit high,for some backwheel stuff I am trying to learn (backwards dork wheelie,with scuffs to keep it going) and megaspins I like the seat lower...but I think ST angle has a lot to do with this as well.My STangle is like 70° so it sticks out the back end a bit,with a steeper ST angle I wouldn't have to raise or lower my seat so much.When it all comes down to it,I believe it to just all be rider preference.