I saw JP started a discussion on the "expert only" feature
here.
I didn't want to wander too far off-topic under the translation so I'm replying here.
I think it is a good idea to remove the option.
All translations are checked by an expert anyway and if the experts of the target language don't understand the source language, the request would have waited until a non-expert would be allowed to do it. It was a nice idea to try when the website was first set up but I think there is no real advantage now.
CC: lilian canale
goncin jp