Norcon - what do you mean by Silicone???
Porque223 - I have no idea what the wall strength is, the fixings I have been looking at our maximum strength
http://www.diy.com/nav/fix/hardware...-Interset-41645-M5-x-40-9281505?skuId=9291205
But they dont say what weight they would support. I also cant find any brackets that these fixings could use.
Somewhere I have specs for the pullout/pullthrough strength for these fasteners, depending on the drywall thickness and fastener diameter. Your application depends on the shearing force it is necessary to resist. The Hillman Hardware website used to have an excellent tutorial for fasteners of all types into materials of all types. Servistar is another hardware supplier.
You could also ask these guys
http://www.rawlplug.com/
Since drywall is somewhat elastic, more than two fasteners in a perfectly straight line may see some load sharing.
Silicone-based adhesive/caulk is definitely elastic and so it may distribute the load quite well but I've never totally trusted adhesives over the long term. A woman was killed in the "Big Dig" in Boston when a chunk of concrete fastened by some type of adhesive fell on her.