md2 animation playback issue

[Mobeen]

Hi all
I have a simple animation of a door opening and closing in an md2 file having 30 frames at 50 the door is opened completely and on 0 and 30 it is closed. My problems are
1) When I try to get the total frames in my animation, it returns 218 frames when I only have 30 in the md2.
2) I am trying to allow user to open the door by pressing the space bar. I have coded the intersection stuff and key handling. Based on users proximity to the door, i get the current door and play its animation using

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node->setFrameLoop(0, node->getFrameCount()/2);

This plays the first half of animation ok but at the end there is a jerk of multiple frames going back and then it comes to a halt. I then replaced this call with this

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node->setFrameLoop(0, 120);

Now it works ok no jerks If i change the end value above or below this value It gives me the same jerks again.
My question is Is this the correct way of doing such a thing or are there better alternatives?
3) What other options do i have apart from md2 , ms3d and b3d? What are others using ?

Thanks
Mobeen