Non-integer mixing percentage? Need better granularity

[sebakke]

I would really like to be able to use a non-integer for mixing percentage. For instance, I have a downline mix when my throttle is near idle. I'd really like to use 2.5%, since 2 is too low and 3 is too high. Both Ethos and OpenTX don't allow for it. I know that it can be done on Spektrum. Is there any reason this couldn't be enhanced?