Sequencer Blend strips (Add, Substract...) with Fader

Some time ago I put together some ideas to improve the VSE, looking at each type of strip and the overall Sequencer workflow. I did an interactive page to present them. Please, check this link: Dropbox: VSE Improvements. Below it is about blend strips:

<h2>All transition types with fader</h2> Something that always made me thing is why is there a fader option for Alpha transitions like Alpha Over and Gamma Cross, but not for such basic transitions like Add or Substract.

So the idea is to unify the interface for all blend strips: Add, Substract, Alpha Over, Alpha Under, Cross, Gamma Cross, Multiply and Over Drop.

Other changes in this image, like tabs and Swap and Reassign buttons, are discussed in my initial proposal, so check it all if you think so. Thank you for reading it, please like it if you like any of these ideas, and be free to discuss them.