VaranisArano wrote: »Using a glitch, whether you caused it to happen or not, is an exploit. Bypassing the need to siege down the walls, accidentally or on purpose, is an exploit. In the link I put above, ZOS points out that bypassing the need to siege down walls/doors is a bannable offense (though as far as I know they haven't taken action on anyone for this exploit, currently.)
A big problem with this is that it is possible to flip a keep without siege or exploiting. Just stealth, let the enemies take it and after everyone left take it back.