How about you add a button that says “Join custom server” on the options “Play game”
And “Create a custom server” (it can be seen on the figures on the hub and the game selector)?
It will pop you a message of the type:
*Join random custom server (It will find you a random cs to join (if it has the setting open to all))
*Join friend’s cs (if he/she has on this gamemode)
*Join with code
*game = a random gamemode
Not be confused as a duplicate. This topic just wants to make changes on cs joining.