tharris wrote:
I gather that this one isn't. Any idea why?
It's just one of more than 2400 open issues (feature requests and bugs) and there is a more generic request for it
http://www.mantisbt.org/bugs/view.php?id=7840
MantisBT is driven by a few non payed core developers working in their free time for it.
It all comes to priority and a dev or community member deciding to spend their time on a specific issue.
Submitting a patch is always a good idea, as it increases the chances of improvement eventually making it into MantisBT core.
There is a rule, that no feature enhancements or database schema changes are allowed in stable branches.
At the moment this is 1.2.x. Ok, sometimes rules are broken

All contributions are welcome and greatly appreciated.
Patch submissions can be made in several ways. In the order of preference:
1. Send us a Pull Request on our Github repository [1]
2. Attach a GIT patch to the issue
3. Attach a Unified Diff, clearly specifying the patch's base release
Kindly avoid to upload entire modified PHP files.
Please make sure that your submissions adhere to our Coding Guidelines [2], if they don't your patch might be rejected.
[1]
https://github.com/mantisbt/mantisbt
[2]
http://www.mantisbt.org/wiki/doku.php/m ... guidelines
tharris wrote:though we try to keep divergence from open source to a minimum.
Good decision.
That's why we offer even more ways of customization where you don't have to touch any existing source code.
a) custom functions b) a plugin system (the newer approach introduced in version 1.2)
You could write an own "My View" page based on the current one, implemented as a separate plugin or custom function which extents the main menu.