It appears as though in order to get Flask this way, I have to either also get Pylons, googlemaps, etc... or I have to unzip an exe and install it manually.
The "Base distribution" is a distribution of packages for some specific needs. If you need individual installers for Pylons, googlemaps etc. you need to look elsewhere.
But if that's all you want it's easier to type eg. "apt-get install python-reportlab" on *nix.