[PouncingAnt]

Well, I suppose you already guessed this, but for instance, if you take the word 出発
As an example.. its Shuppatsu. So, as usual, you get the next letter and add a stronger pronounciation to the constonant.

Also, to do a small tsu in IME, I usually type "ttu" to get っつ and then delete the last tsu to get っ

Anyway, does that answer your question?

EDIT: Also, if it has a small tsu reading, you're not going to find that at the end of a word, methinks.