This is just a general question about all db providers that create sequences.
Should the db provider, in this case Oracle (not supported) be responsible for dropping the sequence object it creates? Can I somehow hook into the DropAndCreateTable method and drop/create the sequence by hand?
You'll have to ask any Oracle questions with the latest contributors they make all decisions concerning the Oracle provider and may have reasons for sequence behavior.
There are Pre/Post table hooks for OrmLite.