Hi. I've been using mumble for quite some time now. 4-5 years. And there are 3 things that i would comment about.
1. Being a setting in configure/settings. The advanced option down in the buttom left corner.
Should be on by default in my opinion, because its small and its in the corner were people usually dont look, basicly hard to find in my experience with users.
2. Then you have the setting in Audio Output under Audio Output which mutes everything by 50% default except mumble while other people are talking. Me beeing a gamer were sound is key, don't like that this setting is on by default. New users that haven't used mumble before doesn't know this setting is on by default and thinks that mumble is shit because their sound dissapears ingame while other's talk. And they think they can't do anything about it, and usually i dont get the time to explain before they have left and uninstalled.
3.Then you have the feature overlay, in lot of situations people dont like that this is enabled by default. This isn't only my experience, but every new guy/girl to mumble always complain about it after they have installed it and think they can't remove it. So because of the complaints that i've had during these years i've been using mumble, i would like it if overlay was off by default since it's a feature.
Sincerly Scrubsphobia - loving mumble server owner