With this pack you can have more than one animation on your build. No Math required, the system help you to find the good pos and rotation. You can have more than one avatar who can sit on only one prims.
Users have the choice of the anim. Users can use PUp or PgDown for change the anim or touch the objet for a blue menu.
How to use:
1) Make your object.
2) Drag and drop animations from your inventory to the content box of your build.
3) Drag and drop the script "...speedy_sit" to the content box of your build.
4) Rez near your build the "configuration BALL" and touch YOUR BUILD. The ball that is now stretched so you can see it.
5) Sit on the ball. When you see the blue dialog select one anim.
6) Edit the position / rotation. When you are happy with the position of the animation, click Save on the menu.
7) Select another animations on the menu and repeat step 6 for each one.

Name the notecard "configuration 0" and drag'n drop the notecard in the build.
9) Enjoy.
If you want more than one avatar who can sit, drag'n drop another script, repeat step 4 to 8. But save the notecard of the avatar 2 under the name "configuration 1" ....
How to find:
On XstreetSl
http://www.xstreetsl.com/modules.php?name=Marketplace&file=item&ItemID=1105387
Or inworld:
http://tinyurl.com/6coluq
The script are under version 0.5 (it's functionnal but BETA for the moment, if you find error, send im to naofan Teardrop) Update version are only available at my home.