It will be possible indeed.
Atm you can check in a single event about the collision with object types belonging with the family.
For the instance variable filtering, it's not yet implemented, it will be in the next releases.
If this is something you're going to need, I'd stronlgy advise you to take an early adopter license
today (it is the last day at the discount price).
It is a matter of time/releases before the feature is implemented and stable.Kyatric2012-01-19 00:08:42