Specify Default Blend Mode per SBSAR User Channel Output
Custom User Channels are limited in their effectiveness by not being able to defined a Default Blend Mode. Base Material types in particular that are designed to interact with those custom user channels, currently require that 1.) A user knows the intended blend mode 2.) The user changes the blend mode for each instance of the material that targets that channel.
AO, Normal, Height, etc.. all have default blend modes. Custom User defined channels really need this too.
Ideally, IMO, the value can be set in the SBSAR and the user never needs to worry about it, similar to other I/O attributes