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?
it's not the physics behavior normal behavior ... Try to use some high forces/impulses on the player ...
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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 ...