[Request] Exact Input/Arithmetic Input

[Nallek]

I was hoping you'd be able to implement either built-in support for exact (as possible) input based on the various belt-throughput values. E.g. instead of inputting 26.666667 as the amount you'd like per second, entering, say, s (for yellow), f (for fast), and e (for express) which would give a consistent and as-accurate-as-possible value.
Alternatively, allow arithmetic input. E.g. instead of inputting 26.666667 you could input (80/3).
I do understand that for all intents and purposes, typing in 13.333 or 26.667 is good enough. Still, if it turns out to be a simple implementation then it'd be much appreciated!

[doomeer]

Seems quite reasonable indeed. Although I'm not actively playing Factorio, and thus not really active here (I try to at least update recipes and merge pull requests though), if I do this should be rather high on my priority list as it is a rather simple request.