If you will be making many OPs or posts that need to follow a similar template, you can create the template, send a PM to yourself and use the "label" feature to allow you to quickly locate the PM.
This is a work around. PM were not designed for that. Although it works, and it is a good idea, when the administrator think about solution he shouldn't think about workarounds.
What you are suggesting should be done in the drafts pages, not in a PM sent to yourself (which is like an autism solution, nobody should be able to PM yourself)
When there is limited time/resources to implement new features, a work around is probably the solution you are going to be offered. I don't believe the administration has a lot of people working on coding new features.
I have emailed myself before so I can have access to things like links, files or ideas that I can reference later, especially when I am not at the computer I conduct most of my personal work when I come across any of the above. I don't see why a PM would be any different.