On my own machine.
[root@bugzilla default]# grep -r instancename *
global/header.html.tmpl: h1 = Param('instancename')
index.html.tmpl: window.sidebar.addPanel ("[% Param('instancename') %]", "[% Param('urlbase') %]sidebar.cgi", "");
Reason I'm asking for something similar on bugs.gentoo.org is I *had* 4 "Bugzilla" sidebars before I got fed up and reloaded them with hand-edited names.
I think it'd be nice if more sites used a custom name, though, as Bugzilla grows in popularity.
This would be something that would almost definitely get forgotten about any time we upgrade bugzilla. Not worth the effort, imo.
closing as wontfix