Yes. And since it's a new thing in 2.8, it might be pretty easy to do at this stage, before 2.8 is stable.(JCR tends to treat all IDs as Strings anyway, so it's a safe move.)
Ok. Not too hard to do...
Yes. BTW, any preferences to the serialization format of the ACLs? I'd prefer something human-readable rather than direct Java serialization...
No preferences...
