This script let your .nl2sco objects rotate!
Put the script into the same folder as your object (...) and add it with the script tab in the nl2sco editor ;)
The speed can be controlled by changing the line:
" ... rotation rate = 0.5f; "
Please keep in mind that you need a point instead of a comma and the floating-point (f) behind the number.
With a minus in front of the number, the rotation will change the direction!