The extension can be made that's not a problem the thing is the price, I would have to ask one of the guys to take a look at this because they are a few things to take in to consideration...example the amount of stress that will be going through the extention, agpatel21 does have a point about the type of movement. On the rotary it's quite simple, it just spins. Like I said anything can be done it's just a mater of price that's all.
now do I see any benefits, well when I first used it I thought it would feel wierd but it actually feels very confortable. I don't even notice a difference, it does have some advantages...like side mirror sections, I can manipulate my rotary a little better and having more clerance in between helps the manipulation. Oh another good one is when doing sports cars and they have a spoiler....depending on the type of spoiler if it's a low one it will help if it's a high one it could restrict you...either way spoilers are no fun when it comes to detailing

. Another advantage I've noticed is I can plase my hand closer to the pad and becuase of the gap I don't have a fear that the pad would catch my fingers.
Disadvantages...mmmm...oh I got one...when your doing the lower panels and if it's a really low vehicle it takes some playing around with the machine and not hitting the ground or ending up with bleeding nuckles....mmm...can't think of another one I'm sure I'll come accross another one and I'll try to remember.
Either way, the backing plate that I use is wicked and well worth the bleeding nuckles...works for me and I'm happy with it
I'll get back to you as for the extension for the PC but to be honest I'm not sure you will like the price...to build one peace is $ but to build hundreds/thousands is another story...but I'll let you know. My way of thinking is anything can be done in this world, it's just a mater of how much you are willing to spend for it....but that's just me.
In another note, I have the Edje connectors and I have never had a problem with them...what happend to yours? Just wondering.