To my understanding, the main concerns in regard to cluster bombing have to do with the after-effects, the residue, with the delayed-fuse ones that may be sitting there for children to pick up, the ones that are in danger of exploding again or being a hazard to people. Other cluster munitions explode on impact, when they're delivered.
So they may very well be strategic weapons for a military to want to have, but they're still cluster bombs. This agreement in Oslo may very well be trying to define that, to say that the delayed-explosion ones, or the ones that just lie there waiting for somebody to approach the proximity and pick up or disturb them... It may well be that some of those cluster munitions could be banned and could be regulated against while still allowing for others that don't have those characteristics.
Once again, I think if you wait to see what is the collective wisdom that comes from Oslo...and I would agree to join with them, to be part of the discussion to see whether there isn't that type of defining coming from it, with the overall intention of doing what you want.