I want to create a plattform game with a rolling character. If I use the physic behavior the character is moving way to slow and is very dull.
How to keep the physic behavior but reduce the idleness?
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it's not the physics behavior normal behavior ... Try to use some high forces/impulses on the player ...
Impulse, which is a one shot deal, should be 50 - 100+ for good effect.
Force, which is added over time, should be much less, like 1-3 or something (I've played more with impulse than with force)
Also try tweaking velocity if you want some stable speed ...