hey thanks for the tutorial. set driven keys seems to be useful. I liked how you were able to set your own max value to the key and the movement on the door was in dependent from that value.

when I used the connection editor the door moved on a 1:1 value ratio for the translate value for the door.
(Ie. my door needed to move five units left or right to be fully open. so for the connection editor I needed to set the attribute to 5. If I set it to 4 or 6 as an example the door would either not open far enough or to much.)

I will also make a quick tutorial on how i did it and show some of the vast ways you can accomplish the same tasks ;D