> I can define 'QQ' -> '\mathbb{Q}', 'fN' -> 'function', '`/' -> '\frac{<++>}{<++>}<++>' or even 'pmABCD' -> '\begin{pmatrix} a & b \\ c& d \end{pmatrix}'

Out of curiosity, why do all these in your editor rather than in TeX? For example, `\def\QQ{\mathbb Q}` would work just fine, and be only one more keystroke. (The third example could be made into a parametrised macro, but `\frac` is already such a macro, so I guess that you're really valuing the keystrokes.)