Number of Questions Regarding Tekkit

[Cozi]

So Im planning on Opening a rather large server with the main point of it being Tekkit.

The server will eventually reach around 300 people...Will tekkit lag a server out with that?

I shall be using verygames.net

And my other two problems are

Is there away to disable the explosives in tekkit such as Industrial TNT and the biggie nuke as well as anything else that can be used to grief

Lastly a few of my beta test members say that a few items are disabled is there a way to enable everything in the pack?