When I am selecting my droplet distro, I am choosing Ubuntu 14.04 32-bit, but if I then select any applications it resets my choice to blank. When I then go to create a droplet it defaults to Ubuntu 14.04 64-bit. I am using firefox.
The application images are pre-rolled on Ubuntu 64x so unfortunately you can't select a specific distro and a specific application stack at this time.
But we will be looking to address that in the future by allowing members of the community to share their created application images.