In the Screencast you can see that if a platformplate connection is mirrored, the settings in the connection it self are not mirrored.
This means that after you mirror this connection you have to change the settings manualy afterwards.
If you mirror a "two endplate , refference beam" connection, the connection is mirrored correct.
It would be nice that if you mirror beams with connections, the beams and the connection are mirrored as it should.
Maybe it is an option to add a setting in the connections to switch the plates over the x, y or z axes, so you do not have to manualy change the settings to negative or positive values.
The best solution is off course is that every connection is mirrored the correct way.
screencast movie: http://autode.sk/2psnroD
regards
Carlo Heisterkamp