Wrapper functionality

I've been using HTML::Template for a while now and am familiar TMPL_INCL. If
you wanted the main template to be nested inside an "outer" template, say
one that contained the header, footer, and navigation, you could do that in
Perl: instantiate HTML::Template twice and put the output of one as a param
in another.

Just recently I did a little playing around with TT and found it's WRAPPER
directive very useful. It basically does the same thing but because it's
built into the templating system, it's a lot cleaner.

This seems a useful and basic enough feature that I was wondering if there
was a reason it wasn't included with HTML::Template? Performance, something
else?

Just curious,
John