Note: please don't make identical merge proposals for trunk and the last stable unless trunk really needs a different kind of patch. The last stable branch can always be assumed to be periodically merged into trunk, and having both increases the administrative burden and the chance of creating conflicts.
Similarly, I'm not sure you should be making merge proposals for your various backport branches immediately after making them for the official branches: that sounds like increased noise, more administrative work, more chances of conflicts... perhaps only do that when you think the official MPs have been pending for too long? (not sure what makes the most sense, you decide)
Note: please don't make identical merge proposals for trunk and the last stable unless trunk really needs a different kind of patch. The last stable branch can always be assumed to be periodically merged into trunk, and having both increases the administrative burden and the chance of creating conflicts.
Similarly, I'm not sure you should be making merge proposals for your various backport branches immediately after making them for the official branches: that sounds like increased noise, more administrative work, more chances of conflicts... perhaps only do that when you think the official MPs have been pending for too long? (not sure what makes the most sense, you decide)