1. Is there any way of altering how these Storage Templates are created on import?No. I logged enhancement request on that
2. Is there any way of making the import create more useful Storage Templates as having 200 of them is a bit pointless?It relates to question 1. What do you mean by more useful?
3. Is there any info as to what basis a storage template created on import?When certain object is imported it's storage templatesand if there is no other template with same properties new one is created (tablespace is not taken into account) properties are taken from database (or DDL script)
what I could do with them would be helpfuas the name template suggest you an use them to define storage properties for set of objects. You even can set tablespace in template and if specific object needs another teblespace it can be defined at object level.