I dunno since Duty Finder is limited via x number of servers how hard would this actually be?
Bout 8-12 servers per DF group so let's say even if you don't make something in game why not something online?
DF ticket reserve. For friends on different servers that would like to play together (because servers were full and getting groups to actually get into certain servers became an issue because SE never really setup a way for friends just entering a game to join servers with 1.0 players stuck on 1.0 servers) It would be nice if there was a method to create tickets for DF and then have the player insert the code and then you just wait for the other players to put in the code and then everyone can play together even if they are on different servers.
Something like this.
Instance(with dungeon do you want to reserve)
Party Members(amount of players being invite to this instance)
Player name/Server/RolePlayer name on this line, then a server drop list on the line next to it, Drop list of which role the player would be using)
"Register"
The system will put in the variables and create a code for all players to use to enter the same instance or instead of making a code the system could register and place a "premade" instance in game and once the player logs in they can select DF and select the "DF Reservation"
Upon clicking it the info would look as followed
"Duty Name, Players involved, amount of time left on registration"
Each Registration would stay active for 1-2hrs depending on the restrirction but honestly I feel like a website/in game integration would be better than nothing. I can understand them not wanting to put everything into the game itself because it would be a bit harder to keep having to do the checks and send the info between servers however with DF and servers being in the same cluster, this system would just imo use less resources checking for 1-7 players in xyz server rather than DF which currently checks for x amount of players and attempts to properly set them up together.
All they would have to do in game is create a code to alter the DF to have a check for reserved instances that a player could click on and "ready" themselves for and when the player "readies" themselves it would just keep waiting til the other members were rdy and once everyone was ready it would start the instance.