Well the value you're talking about is "hardcoded" in the physics behavior
Apparently, it is used (its derivated Box2D.Common.b2Settings.b2_maxTranslationSquared) in the "Step" operation.
Atm, apart from making another physics behavior in which you would encode 10.0 instead of 2.0, I don't think there is a way to modify this value from C2, it's just not interfaced to be modified.
If you want you can make a copy/derivative of the physics behavior's folder and modify the value l.73 of runtime.js. Be sure to check the SDK manual
and to make backup copies of the original behavior before any change.
Also be aware that modifying/using a custom plugin/behavior will make it so that you can't upload your final game to Scirra's arcade (in case you were aiming to publish your game there).Kyatric2012-05-24 16:00:05