Hi, are you the Hauke Rabe I met on Devoxx this year? If so, welcome back! Otherwise, also welcome!
We haven't put Sybase on the roadmap, since we target the big-ones (oracle- and IBM-like) first.
But making Activiti Sybase compatible shouldn't be that hard, when there are people actually able to test it (ie you ;-).
Since we're using iBatis as ORM framework, all the SQL statements are externalized in files. It is to be expected that the SQL shouldnt differ much
from database to database. But the fact that we have them in a separate files, makes it really easy to make database specific changes for them,
and plug them in the engine.