Flopped flush in limped pot, best line

[Wish]

Poker Stars
No Limit Holdem Tournament
Blinds: t50/t100
9 players
Converter

Stack sizes:
UTG: t435
UTG+1: t6740
MP1: t1980
MP2: t2780
MP3: t5862
CO: t3266
Button: t2690
SB: t2595
Hero: t1190

Pre-flop: (9 players) Hero is BB with T[img]/images/graemlins/spade.gif[/img] J[img]/images/graemlins/spade.gif[/img]
2 folds, MP1 calls t100 <font color="aaaaaa">(pot was t150)</font>, 2 folds, CO calls t100 <font color="aaaaaa">(pot was t250)</font>, Button folds, SB calls t50 <font color="aaaaaa">(pot was t350)</font>, Hero checks.

Flop: 7[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/spade.gif[/img] (t400, 4 players)
SB checks, <font color="#cc0000">Hero ??</font>

So, two questions here. First is preflop. Should I just be jamming here to pick up those limps? 3 limpers is a significant increase to my short stack here.

Second, obviously, is after the flop. While it's possible that somebody limped with AXss, I'm short stacked enough that I don't think I can really be afraid of that, my chips need to go in and I just need to figure the best line to get somebody else's chips in with mine. Advice?