whoa hold on there buddy, its ok to do it before a public release, I do it all the time as a non-permanant thing
Whats even better for testing is the cordon tool (took me freakin ages to realise it was there and what it did!)
it has exactly the same effect as enclosing your map in a box, with one benefit - it only compiles the stuff inside the area you select - so if you only want to compile one room use the cordon tool around it and it will cut compile times down hugely.
Don't overlook the cordon tool, its a beauty for time saving!
Basicly sealing your map in a huge box is the stupidest thing you can do to a map
well............ other than leaving it all orange for exactly the reasons lord ned said. (And don't
ever assume that because your pc can do it others can as well)