We don't personally like agile.
We would like to add the ability to order problems - both a personal work order queue, like "I'm doing this, then that, etc." and globally within a milestone, which I think is what you had in mind.
Arbitrary attributes are supported, so you could track point estimates that way, but you're right, nothing like that is surfaced at the top level. Perhaps we can think of a good way to surface things like this without reaching Jira-custom-fields level of pain.