Just for the record, you could also use transclusion*.
For example, you might have a tiddler [[TicketTemplate]] with the
following contents:
[[ticket $1|http://trac.tiddlywiki.org/ticket/$1]]
Then you could use the following macro call:
<<tiddler [[TicketTemplate]] with:"100">>
Of course this is much more verbose than using Eric's AliasPlugin, so
it's probably not a good alternative.
-- F.