If you do that want to tackle one I've wanted for awhile ( tempted to try and figure it out myself tho as well ).
$ git flow feature stage feature-1 feature-2 feature-3
Quite often I want to do an integration build of a bunch of open feature branches that may interact, or impact each other.
What this should do is create a a branch off of develop called say "staging-nnnnn" and merge each feature into it, as tho they were being "feature finished", then switch me to that branch.
The other git-flow command I'm finding I'd really love to see is a "git flow feature squash xxx".
But yes - back to the original comment - a hotfix publish would be handy, currently we've just been doing "git push origin hotfix/xxx" when we've needed multiple people working on the same hotfix.
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"Great artists are extremely selfish and arrogant things" — Steven Wilson, Porcupine Tree