I don't think widening the runway is a good idea. It cause problems under P3D, which always display the default runway, so it goes in conflict with the custom runway texture.
In fact, the whole issue happened because we LISTENED to users complaint about having the default runway showing up in P3D, in other airports too:
http://www.fsdreamteam.com/forum/index.php/topic,9527.msg88693.html#msg88693So, to fix this, we had to set the runway width to 0.0, causing AIs being stuck so, we are trying to discuss with LM for a solution that would work both in P3D and FSX, without having to distribute two separate AFCADs, which is quite confusing, both for us and for users.
But of course, if you don't use P3D, you are free to apply the suggested modification.