I, as a P4V user, would like to merge a pending changelist to an other branch.
Sometimes I have to verify a Problem on a release branch. On release branch I will do some changes to fix for example a bug.
(Note: I do first work on release branch, as I may do not know whether the same issue exists on Trunk.)
As we actually do Trunk based development, I have to check in my changes on Trunk.
So it would be a nice feature to merge a pending changelist to Trunk to end up with a pending changelist on Trunk (may the files would have to be shelved to benefit of this feature)