A few questions!

Firstly, if raiding/base griefing is allowed but most of the items capable of getting in are banned (ESPECIALLY if faction chest-locking is in effect), any techniques you could recommend? Any chance of getting the Mobcatcher plugin on, so we could carry Creepers (grenades, if you will) around with us after trapping them in eggs? In my Tekkit experience, when all that TNT is banned it's nice to have a way to get into a base you find, as Faction control often makes that impossible. The creepers are a good way to circumvent faction protection, but you have to be A: creative, and B: put effort and expense into getting them.

Secondly, is there (or would you consider) adding a map boundary, possibly to be expanded as more people join? Not having one makes PvP actually difficult, as the area an enemy faction could be in is, effectively, infinite otherwise.

That aside, it looks like a good server. I'll probably be making this my home for a good while.

TNT is not banned. It can be purchased at the store.

We will look into map boundaries but until now we are keeping the map as is.