Revisioning scheduler: schedule several revisions how?

I'm using Revisioning 7.x-1.4. I have a requirement to schedule more than 1 revision at a time. F.e. publish revision with some announcement and then revert to older revision. I'm curious why this line in revisioning_scheduler.module does not allow such behaviour:

    _revisioning_scheduler_unschedule_all_revisions($node->nid);

If I understand it right, this is a matter of switching current vid in "node" table. Or there are other reasons to remove all scheduled revisions first?