TKOF ABORTED WHEN DHC-8-I FO UNABLE TO ROTATE ACFT DURING TKOF PROC.

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ON THE TKOF ROLL FROM RWY 29 AT INTXN ROMEO AT EWR; THE FO BEGAN ROTATING THE CTL WHEEL AT THE 'V1; ROTATE' CALL. THE NOSEWHEEL WAS NOT COMING OFF THE GND AND THE CTL WHEEL FELT NOSE HVY. AT THIS POINT; THE PF CONTINUED TO APPLY BACK PRESSURE AND ROLLED IN NOSE UP TRIM TO LIGHTEN CTL FORCES. THE CTL FORCES REMAINED HVY. THE NOSEWHEEL STILL STAYED ON THE GND; AND THE TKOF CONFIGN WARNING HORN SOUNDED. WE BOTH CALLED FOR AN ABORT; AND WE BROUGHT THE ACFT TO A STOP. WE NARROWLY AVOIDED RUNNING OFF THE END OF THE RWY. AS OF THIS WRITING; NO PROBS HAVE BEEN FOUND WITH THE ACFT LOADING OR WITH THE ELEVATOR OR TRIM SYS. ALTHOUGH WE STOPPED THE ACFT ON THE RWY; WE COULD HAVE IMPROVED OUR SAFETY MARGIN BY THE FOLLOWING: 1) NOT USING AN INTXN FOR TKOF; 2) NOT TAKING OFF DOWNWIND; 3) EXTRA ALLOWANCE FOR A WET RWY. WE MET ALL APPLICABLE CRITERIA FOR TKOF; EVEN DOWNWIND AT AN INTXN ON A WET RWY. IN PARTICULAR; INTXN TKOFS ARE ENCOURAGED AT OUR COMPANY TO SAVE MONEY. WE DECIDED ON THIS TKOF TO AVOID A DELAY OF APPROX 1 HR TO USE RWY 4L; WHICH WOULD HAVE GIVEN AN ADDITIONAL 4000 FT OF RWY AND NO TAILWIND. IN HINDSIGHT; WE CUT OUR SAFETY MARGINS ONE BIT AT A TIME UNTIL WE HAD VERY LITTLE LEFT. I ALSO BELIEVE THE POLICIES THAT ALLOWED US TO MAKE THIS ATTEMPTED TKOF UNDER THESE CIRCUMSTANCES SHOULD BE EVALUATED. SUPPLEMENTAL INFO FROM ACN 290983: FORM A JUDGEMENT POINT OF VIEW; IN FUTURE; I WOULD PROBABLY ELECT TO ACCEPT THE DELAY AND ACCEPT A LONGER RWY FOR TKOF. ALSO; THE DECISION TO ABORT AFTER V1 IS NOT NATURAL; I.E.; IT IS INGRAINED IN US FROM TRAINING THAT AFTER V1 CALL YOU CONTINUE; HOWEVER; IN THIS SIT; THE ACFT DID NOT WANT TO LIFT OFF. THE DECISION TO ABORT THEREFORE MAY HAVE BEEN CALLED 1-2 SECONDS LATER. IN TRAINING; I HAVE EXPERIENCED A PITCH JAM IMMEDIATELY AFTER BEING AIRBORNE; BUT NEVER THE SIT WE EXPERIENCED. I WOULD LIKE TO POINT OUT THAT OUR WT AND BAL WAS CALCULATED CORRECTLY AND WE WERE LOADED FORWARD CTR OF GRAVITY BUT WITHIN NORMAL TKOF LIMITS.