You don't need to be constrained to a single monolithic idea (e.g.,
"add multi-db support"). However, if you take the "lots of little
issues" approach, you should try and pick a single area to concentrate
on. For example, you could pick "form rendering problems" or
"join/select_related() problems". This focus helps us assess whether
you understand the area you're proposing to fix, and makes it easier
for us to select an appropriate mentor.
Yours,
Russ Magee %-)