I think that keep inventory plug in does not really fit into CCnet Nations. The thing about making/grinding swords and sets that it might be hard for smaller nations but I'll return to that later. But from my point of view there shouldn't be keep inventory on sieges where a big nation gets sieged because that nation does have grinders that can grind back those sets/swords. For example Imperial_Romanum sieges Thracia *(just an example)* in that siege there shouldn't be keep inventory because there are two big nations with grinders inside that nation with well organized non peacful towns where xp is grindable and easy to get.
About smaller nations getting sieged by bigger ones or by other smaller nations it should stay keep inventory because 99% of the time the leader of that nation is new and didn't even get to make a proper non-peacful town not even to make sets/swords.
That's my opinion about what I think should get added/modified.