There's a new button above the 'add ons dialog' when you start up the tools , says something like 'launch item tools' (it's very easy to not notice.) Hit that button and there's a really nice interface that imports all mask channels in one file like before. The main thing is that the alpha channel is split form the…
Regarding the channels being split into individual textures : I think it's a good move, because it accomodates all workflows ! - People who were using scripts to spit out diffuse/mask1/mask2/normal TGAs out of a single PSD in one button press can continue to do so, simply editing their output according to the new system…