Neither of those really suit my needs, but it might be trivial to add the following things for an upcoming release, especially with all the work done to make the interface pretty under 2.5:
* Add a description field to the banner. This would allow at a quick glance what the banner is.
* Add expire by date/time. Some promotions are date-dependent and not impression-dependent.
Also, in 2.5 all of the fields except Extra Info are mandatory. Is this truly the case, or can that be reverted to the Client Name only? The other fields are nice, but I don't quite agree with the mandatory flag on them.