Anything with an accent-tap type exercise will help with that. You just need to get used to "stopping the stick" as you put it.
A simple one is bucks, where you play 8 on a hand, accenting the downbeats. You can also try the upbeats, or whatever else you can come up with. Make sure you only play it at a speed where you can control it effectively. If you can't control it, you're not helping yourself, you're only practicing incorrectly and with bad habits. This probabaly means starting very slow, but you'll have to play it by ear as your practice.
Hope this helps,
Baker
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