Not sure how hard it would be (if possible at all), but here's what I found
myself in need of when using the sql plugin on a database with a fairly large
number of tables:
1. speed search in the database structure view (for the tables list, mainly).
This would be a lifesaver
2. code assist for table name completion (Ctrl+Space on a partially specified
table name - say after a FROM - would bring up a list of candidates).
3. undo in the SQL window, for those cases when one accidentally deletes
the selection instead of executing it (by pressing Enter instead of Ctrl+Enter).
Thanks again for a great plugin,