Global Categories - Autoassign customization by project

[luizgmk]

I want all projects to keep the same global categories so that I can extract global statistics based on them, but I want each project to be able to customize the user that will be automatically assigned to new issues based on the global category selected by the reporter.

Another thing I would like to do is setup e-mail triggers based on category/status. I mean, I would like that a new bug reported for a critical project will automatically notify a group of users so that it become known fast.

Can I do such things without customizing Mantis or is there a plugin that already implements those features?

[atrol]

I want all projects to keep the same global categories so that I can extract global statistics based on them, but I want each project to be able to customize the user that will be automatically assigned to new issues based on the global category selected by the reporter.

Makes sense, but there is no "half global" category available

Another thing I would like to do is setup e-mail triggers based on category/status. I mean, I would like that a new bug reported for a critical project will automatically notify a group of users so that it become known fast.
Can I do such things without customizing Mantis or is there a plugin that already implements those features?

You would have to write a plugin for this.
I didn't have a deeper look but maybe this one http://git.mantisforge.org/w/automonitor.git
can be a starting point as the description says:
"Allow definition of a set of users that should automatically be added (as a monitor) to new issues in a project/category"