Per channel normalization reference

Hello, I've been having some major problems getting clean multichannel blending results if I attempt to do all channels together at once in APP. To work around this issue I have been integrating a mosaic for each channel and registering them later in Pixinsight. The problem I am encountering now is I have a 25 panel mosaic of andromeda that cannot be registered properly in either PI or APP if I try to align each color channel mosaic. 

So now I need to be able to integrate and stitch my color mosaics at together in one go in APP, because I cannot get them to register any other way. But sadly when I integrate the panels together in APP with multiple color channels, it will attempt to normalize one channel with a panel from a different frame, which creates a terrible result in the blend. 

A very simple fix would be to allow per-channel normalization references so that I can get clean blends for all my color channels.