Ability to hold onto Record Collections across form events. OR ActiveRecord/ORM'ish relationships
Right now each form event (on add, edit, validate, etc), is pretty much it's on sandbox when it comes to variables. I would love the ability to load in a record collection "pointer"/ model that can be accesses across the events. This would cut down a lot on unneeded "state" fields that are pretty much only created to bridge the gap from say an on-add to on-validate.
I recommend a "collection" field that works much like formula or just a global name space mixed variable map(). Where you could stick strings, records, etc.