What features would you like to see in Pixelmator Pro?
For Second Life, sometimes it's desirable to save a file in Targa (.TGA) format. Second Life accepts JPEG, BMP, PNG, and Targa formats; only PNG and Targa are supported with alpha channels, and of those two, only Targa is lossless.
Going to second the utility of this for gaming development work. There's a bunch of files in .tga format in the Minecraft texture packs. Royal PITA to use online converts that try to gouge you for $ when you already own a slick piece of software where you do the rest of your work....