Where should I post if I wanna send a message to the developers at beth about something that should be included in the next update?

My suggestion is:

I have looked into it and am almost positive that it is possible to allow anolog input in m/kb mode, they just need to enable it. I have looked into the controls.txt file, and am pretty sure that it is something that has to be change in the source code and not a settings file, but I doubt it would take much effort. Beth, if you are reading, could you please add in next update?

edit: The reason I want anolog input is for this.

https://www.amazon.com/Logitech-G13-Programmable-Gameboard-Display/dp/B001NEK2GE/ref=sr_1_3?ie=UTF8&qid=1485221519&sr=8-3&keywords=gaming+keypad

The developers do not visit these forums that often. You could possibly try here https://bethesda.net/community/but I have a feeling that they are not working on the game anymore and if there is another update it might just be in relation to mods and the user interface for the game. Most of the updates have been focused on that.

I do not think the Bethesda wants to work that much on the source code since something else might break. You could possibly make a post in the SKSE thread to if something like you are suggesting is possible. http://www.gamesas.com/topic/1612646-wipz-skyrim-script-extender-skseskse64/