The devs said that UI stuff is really difficult to do right now, so unfortunately we just have to wait until things are figured out more.
Beard/Hair control feature would be amazing.
Also, LMS, how 'bout the ability to add and subtract money?
As mods get more and more complex and with Online being so easily joined compared to GTAV, a lot more attention to detail will be needed when adding and removing mods to safely connect online.
I was wondering if it were possible to have a mod manager that removed the files from the RDR2 directory when connecting to online? I know Bilago's Mod Manager for GTAV did similar. I also know it's very early in the modding phases, so I know it may not be easy to tell how possible this is.