confusion about check raising and position

I have been using the line to bet out a flop when i have a 4 flush or OESD, then if it hits to C/R. Has been going well.

Villian here is a maniac on the button, 67%/23% over 100 hands or so.

Party Poker 2/4 Hold'em (10 handed) converter

Preflop: Hero is SB with 9[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, UTG+2 calls, <font color="#666666">2 folds</font>, MP3 calls, CO calls, Button calls, Hero completes, BB checks.

Flop: (6 SB) 8[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(6 players)</font>
<font color="#CC3333">Hero bets</font>, BB folds, UTG+2 calls, MP3 folds, CO calls, Button calls.

Turn: (5 BB) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, UTG+2 checks, CO checks, <font color="#CC3333">Button bets</font>, Hero calls, UTG+2 calls, CO calls.

River: (9 BB) Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks,

the maniac bet the turn, so i think he will bet again and i can check raise.

UTG+2 checks, CO checks, Button checks.

Unfortunately it gets checked through. Boo for me. After thinking about it, if maniac did bet, i would probably fold the field facing 2 bets, maniac calls and i get 2BB. if i lead i probably get called by multiple crying callers, more EV?.
if the maniac was to my left would a check raise be correct?

Final Pot: 9 BB