I'm not really following that, but I jump in, because I think that
the subject of aliases for citations can be easily implemented as a
part of GEP 018.
OK, database stuff...
What I mean is that, if a citation object has a (sub)title like
attribute, I think it should be available for sorting in the
source/citation views of Gramps. And as far as I'm concerned, this
should be implemented in a way that does not depend on users using
templates or not. Attributes are enough.
These days, I see a lot of indexed sources on FamilySearch that use
names to identify records in some indexed data set, like this one
"Netherlands, Deaths and Burials, 1668-1945," index, FamilySearch
(https://familysearch.org/pal:/MM9.1.1/FNHH-F4V : accessed 25 Jun
2013), Franciscus Hendricus Borgsteede, 1845.
I consider this particular citation to be wrong, because this remote
cousin died on 06 Nov 1847, and the actual record must have been
made that day, or a few days later, but that's my of FS' problem,
Anyway, I do think it's a nice suggestion to use the citation title
as alias the view, where you normally see the volume/page column.