ESS business package

I have configured ESS business package WebDynpro base).

I have some concern about on ESS business package

Should I copy the entire SAP ESS business package to the customer name space or assign ESS role to user from original location (Where ESS is installed)

Some more concern I have:

In ESS Business package we do not need to implement lots of area. Eventually we will hide these areas from IMG. If we hide the Areas from IMG, does IMG will look the location of the iviews from the original location or it look from the location where I have ESS business package copied to customer name space?

If we have to modify the business package should we copy this business package to customer folder?

I do really appreciate if someone assists me with my concern.

Fareed