Currently you need to build a siege engine just to expand your palisade if you end up reaching a point where you've outgrown your previous base size, this is inconvenient. If you own the claim, and you can access the palisade's interior, maybe a mechanic could be used to decon palisades from the village side.
This could work by creating inner and outer directions for palisade walls or it could just be claim based.
Possible issue of that is RP related, if someone can dig up their own palisade why wouldn't anyone be able to dig it up? (The answer is game convenience).