Textmate like snippets (at least in LaTeX)

In TextMate in LaTeX bundle, you have 4 different types of calling snippets (I will put a very understandable example, $0 is the placement of the cursor):

• LaTeX symbol based on current word. i.e. If you write s and you use this command you get \sigma $0.
  
• Command Based on current word. i.e. if you write s and use this you get \sum_{$1}^{$2} $0.
  
• Environment based on current word. i.e. if you write s and use this you get \begin{s} $0 \end{s} (or what you have defined before).
  
• And, at last, Snippets (true snippets, as simple as in Sublime Text). i.e. if you write mat and press Tab button you get \begin{${1:pvbPVBsmall}matrix} $0 \end{matrix} (exactly, at least the same way as in Sublime Text).

I wish you could add this option to your program, I mean, one (configurable) key combination for each one of this four kinds of snippets. Anyway, I wait for your answer (saying yes or no, but please tell me you read that). In case of NO as answe, I would really appreciate to hear about your reason.

Ah, and a very very nice program.