I can't see any fine print that clearly states rules about open jaw routing? When logged into EarlyReturns, I shop for travel using the multiple destination function, but it only shops by price/sched...not awards. An example I'm interested in is DEN-MCO/TPA-DEN.

This is the only verbiage I can fine that sounds like open jaws are permitted...
All award travel must be via published routings, and to destinations offered by us, or for awards involving other airlines, via the routes of the applicable airline partner. If a published routing doesn't exist between a desired origin and destination, alternative origins and/or destinations must be selected. The alternative is to redeem two separate tickets for travel between the two cities.

I'll call in the morning if no one has input.