I dunno, I would assume you could do your little stab, stab, pin...assuming your already grappling. In theory using the "escape from Pin" would be considered an attack action, although if the fighter didn't want to put up much fuss he could allow you to go back to grappling. However, after a round of getting poked with a sword, he may want to stay pinned and so might have you make grapple checks to move from pinned to grappled.
DANGIT, I swear I read somewhere recently about rules for choking someone while grappling. And I really thought it was in Modern d20 but I can't find it now. So, I'm not really sure where it is now, but hopefully a spark of rememberance will get me to find it.
Tellerve