Part of what you say is a good idea, but part seems somewhat... well, wasteful.

I have a toolkit-type module that I import to give some commonly-used functions, like a sub that implements s/^\s+|\s+$//g;.

But for stuff like use strict; use warnings; use Carp;, what's wrong with using a template (or macro, or whatnot) in your editor? It makes it much easier for future maintainers to see what's going on, rather than making them dig into another module just to find out that it repackages common pragmas and modules.

Besides, my shortcut for such things ('ns'+Ctrl-Space) is much faster than even typing 'use My::Tools;'. I guess I don't see why you'd want common template-esque things packaged into a module.