why would this be an issue on a 3x00? It is, I tried with a non-standard partition and strange little problems started creeping in...but it seems like it should make no difference as the flash is barely used, anyway.
as to the flash issue being a barrier, it looks like both oz and pdaxrom are moving far from the original sharp config. Probably this has more to do with restrictions imposed by sharp's design rather than random orneriness of unaffiliated development teams.