I don't know if this is a issue for everyone but in our instance of Mantis we currently have 10 projects running. One of the issue that we had is when you try to view "all issues" there was no way to know from which project the issue is. Even if you click on the issue itself you can't see the project name.

I did some changed so that now when you view the list of issues the project name appear in bracket before the summary. I also did the same change in the issue page itself.

In file issues.phtml i changed line 19 to:
<h3 style="font-size:14px; font-weight:bold; margin-bottom:0px; margin-top:0px;">['. string_html_entities( $t_issue->project->name ) . '] ' . string_html_entities( $t_issue->summary ) .'</h3>

In file issue.phtml i changed the line 68 to:
$t_html_output = '<div style="padding: 3px; border-bottom: 2px; border-bottom-style:solid; margin-bottom:3px; background:' . $g_view['status_color'] . ';"><span style="font-size:14px; margin-top:0px; margin-bottom:1px;">'. '[' . string_html_entities( $t_issue_obj->project->name ) . '] ' . $t_issue_obj->id . ': ' . string_html_entities( $t_issue_obj->summary ) . '</span></div>';

Could this or something similar be added in future release ?