I noticed this feature is supported in CME 8.0, any chance it will make it to CUCM?
Cisco Unified CME 8.0 adds support for Unlocked MeetMe Conference. When you unlock MeetMe conference bridge in Cisco Unified CME, the user can initiate a MeetMe conference without pressing the MeetMe soft key, which would allow the external callers to initiate a MeetMe conference.
That's an interesting enhancement to CME. From my internal searches, found that this enhancement in CME was added using
CSCsy80028 RT-LITE: Unlocked MeetMe Conference Support Initial Commit.
However, I wasn't able to find any enhancement defect opened on CallManager for the same feature (unlocked MeetMe conferencing) - my guess is that there is no plan as now on CallManager to implement this feature.
My suggestion would be to contact your Cisco Account Team, so that they can initiate a discussion with the CUCM development unit, to find out if unlocked MeetMe conferencing will be considered for implementation in the future.