I think there is no need to always make export files for linux, ios and windows x32 & x64
The export dialog for nodewebkit should have a box selection option where you choose to which of those OS you want your export for.
I'm guessing most times we don't need all 4 exports, but maybe just one, and it would export faster when we export to only the one we need at that particular moment.
and if you want all 4, you could still mark all 4 options and would end up being just the same as before.