It would be nice to have both in the exporter -- use commas to separate individual frames, and a colon ":" to indicate an interval (such as 1:79, if you really need that many -- is this for a cutscene or something?).
I would love to be on-topic, but I don't actually know much about Unity, nor am I particularly interested in it. I like programming, and A7 is a great environment for programmers (Lite-C is great, fast, it's easy to integrate shaders on a per-model or per view basis, etc).
And ventilator's blender exporter means I really don't care how bad MED is.
