Toolbag 2 has an option to auto-reload the textures. I don't remember exactly where, but it's probably under the preferences settings. And for re-exporting all the outputs of the current graph, you can use the green arrow in the 2D view to export all of them at once.
The word is out already :) So indeed today we are releasing SD 4.2 and the free Substance Engine plugin for UE4! [size=+2]SD 4.2[/size]* Automatic and continuous export - Allows you to see updates to your substance in real time in any hot-reload enabled software (Toolbag2, Unity, Maya, etc.) * sRGB/Linear switch both for…
Hah, afaik, none other than the in-house tool Splash Damage had. There was talk one time about maybe going public, but the guy who made it left so that will probably not happen. Designer is already ahead of all other publicly available bakers IMO, and if they did some more changes here and there they could really be the…