Usability issue - Generation of .pro/.pri files for large solution

When exporting .pri/.pro files from a very large solution (e.g tens or hundreds of projects) it is often the case that you only want to export a small subset. This feature is often used when creating .pro files for porting to other platforms! It is therefore likely to be repeated many many times!!!

1. There is a long long delay before the dialog is displayed. This is a bit inconvenient.

2. You then have to one by one deselect every single project until you are left with the one (or ones that you actually want to export). It is tedious to do this.

I would suggest adding a "Select All" and "Select None" link underneath the list as this would be easily implemented and deliver us from RSI.