Is there a way with the keyboard to select which resource to add to the schematic? I'd like to just use a keyboard macro and this is the only part of the process that seems to have to use the mouse?
no way that I know of. I have trawled through all the /ui combos with no luck. I dont think its something that would have been implemented as there are so many variables since the resources are sorted depending on your pack sort order which could be anything at any given time.