Inspired by the 3-in-1 John Mayer amp, this utility block would allow you to take 3 blocks in your grid and do a parallel blend with adjustable volume for each, maintaining control over the settings within each block.
Use case 1: You like the JM 3-in-1 amp, but you want to adjust the tone controls on each amp within it. Add each amp to your grid, adjust them to your liking, add the 3-in-1 Transparent Blend block after it, then select one amp each for the 3 volume slots.
Use case 2: You like the JM 3-in-1 amp, but you love aggressive death metal. Load up a Bogner, Freidman, and EVH and blend them together. Like the JM, it would likely work best to have one amp set for its best lowend, one for the best mids, one for the clearest highs, then use the volumes like a BMT and set to max death.
Use case 3: You think The Edge is cool, or maybe Andy TImmons. Select 3 delays and create a new delay, or mimic a multi-head delay. Try it with chorus and create a tri-chorus, or some kind of new phaser blend, etc.
I imagine this would be a fairly straightforward block to program.