You defiantly want the twist and push style. Twist it up and down, push to completely release. To stop any over rev situations you need a positive throttle stop, but you should have one anyway.
-= Francis =-
These, in the day when heaven was falling, The hour when earth's foundations fled, Followed their mercenary calling, And took their wages, and are dead.
Their shoulders held the sky suspended; They stood, and earth's foundations stay; What God abandoned, these defended, And saved the sum of things for pay.