Lol, sorry, I read your post wrong 
Okay, with a slight change to the toggle script, you have the desired result (well, kinda):
if frame==1;setVar("repeat",0);setVar("toggle",0);end;if key("space")==0;setVar("repeat",1);getVar("toggle");elsif getVar("repeat")==0;getVar("toggle");else; setVar("toggle",getVar("toggle")+1);end
This is a new particle effects system I'm developing. I'm going to be mean, and not post the model, but I assure you all these pics are from a real-time simulation, running happily at around 40FPS. Enjoy!
You want to toggle it? I have just the thing 
if frame==1;setVar("repeat",0);setVar("toggle",0);end;if key("space")==0;setVar("repeat",1);getVar("toggle");elsif getVar("repeat")==0;getVar("toggle");elsif getVar("toggle")==0;setVar("repeat",0);getSetVar("toggle",1);else;setVar("repeat",0);getSetVar("toggle",0);end;
Change key("space") to whatever, and it's ready-to-go. And don't worry, I didn't write it just for you, it's an old one of mine
Really shows what you can do with the scripting, very nice!!
You might be in for a pleasant surprise
Fixed joints have a breakingForce setting. Connect the two objects with a fixed joint, and change the setting until you have the desired result!
A few things that can cause bugs:
-Intersecting collision geometry (Right click/debug/readback collision geometry/play the sim)
-Flipping objects (Right click/flip along...) has unpredictable results. Try to avoid.
-Scaling a convex hull's group will mess it up. Try to edit inside the group, or explode/re-group to fix.
-Neverevereverever copy joints. Or anything with joints inside. It makes the simulation cry...
Anyway, it sounds like you have messed up gyros. Try what Physicsguy said... oh, and when bug fixing, posting the model always helps. The upload option is beneath save/preview/submit when writing a reply, or editting a post.
Hmm... no, not really
I learnt alot by looking at other people's models. Check out the UI settings of every object, and you'll find out alot. Otherwise, just ask here 
The overall group's shape should be set to 'default'.
I think he wants it to automatically delete the track after the sim. That's easy enough in the new version, but undoing after the sim will give the same result
Lol, sweet. I'm dipping into the API myself, like with the cloth thing... and I agree, it's fun
Btw, the advert is: http://www.youtube.com/watch?v=Lj-LT2IeA9s
Okay, playing around with vectors (another toe in the API pond). Basically, I'm finding them, then changing their length with joystick inputs. I then use them to control the velocity of an object; in this case, the player in an FPS system; this works pretty sweet, so I'll continue to add features, and see where it takes me!
EDIT: Fixed. Tell me if it's not 
You probably want a controller. It was slightly easier in SP2, but all you need to put is:
slider("name")
To make joints:
-Create two objects
-Create a joint
-Group the joint with one object
-Select the other object with the JCT, then ctrl+click the joint
-Play the sim!
Components are fine. You can also group componets with normal groups. Or normal groups in components. Or whatever...
Not much point in SP if you don't play the sim! Press the play button
Thanks Phy! Since you pinpointed it, I found the problem. Seems it was trying to use @@pos2 before it had been created, I just had to add it into onstart and it worked fine!
Yup, that's all we get
It shows you the actual collision geometry of the item, which is what the physics engine 'sees'. It will (sometimes) help fix problems in models.
O_O
It's mind-blowing, I don't know how you've got the patience to make sonmething like this...