I will be releasing a version of ShneekeyCraft on
ATLauncher. However, the ID's will not be compatible. The version on the ATLauncher, in addition to having a slightly different mod setup, will have ID's set up from Resonance Unleashed. The upside to this is that you can use ANY mod supported by that config pack (including any mod in Unleashed or in Resonant Rise) and it is guaranteed to be able to work with those configs. You will need to manually include the config from the Resonance Unleashed pack to guarantee compatibility. Expect to see it in the coming week.
I will not pull ShneekyCraft from the FTB Launcher, however. The LTR release 1.3.3.7 is just that: A Long-Term Release. It will be up as long as the mod pack team permits it.
Please note that ATLauncher does not distribute mods, it merely points the user to the websites to download them if it hasn't already been downloaded. This means it takes more effort on the user's part to download those mods once. From then on, the mod will already be there and you won't need to download it. Due to the delta update system, you will only need to re-download mods that have been updated to newer versions. Also, since ATLauncher does not distribute mods itself, it is not in violation of distribution without permissions, because it isn't distributing anything at all. It's rather like a glorified config list that automatically pulls websites up for you.
I'm doing this to test how ATLauncher works, to see if just makes more sense for ShneekeyCraft to be run through ATLauncher or the FTB Launcher.