Fairness, equality, leveling the playing field, change the rules, paddle to ledges etc etc blah blah blah. I think using a kayak to get to that otherwise inaccessible ledge or rock on the shore is a great idea if your up for a challenge or you just want to push that extra kilometre. Theres nothing wrong with pushing the boundaries. Its a good idea and good for the sport. But can it work in a competition arena? I don't know.
The main problem with all this was actually put forward by Neil ages back on this thread and that is cheating. There will always be that temptation for someone less honest to this if you include kayaks? How do you get round that one chaps? Or is so unlikely ir doesnt matter?