I didn't express myself very clearly, I'm afraid. I didn't mean separated users as in user accounts, but that there is no visual separation between channels I join in a network and the users I open direct messages with.
If that's not enough, I'm sure you could write some CSS to make the difference stand out even further. There's a custom CSS box in settings that you can put your styles in easily.
By visual separation I meant for example a vertical line with all channels being above that line and all users below it. I realize I can rearrange them manually, but I frequently join/quit channels and message new users in some networks and have that happen automatically would be a "nice to have" feature for me.
Clearly this didn't bother me enough to actually implement it or even open an issue with a feature request, so please do take this with a grain of salt.
Thank you for working on this awesome project and responding to my feedback!