ePMP up/down split added between 75/25 or adjustable like PMP450

Any chance we can get a TDD split of something between 50/50 and 75/25?  75/25 is so close to being what we want but the upload isn't quiter there....   maybe a 70/30 or 65/35 would be fantastic.  Any reason this number can't just be input like the PMP450 equipment?  Thanks