Maybe not raid matchmaking but how about a board that you can post something that notifies you are looking for a group or maybe shows up by your name and level in the tower like a color or symbol or something so like for example you would have your level, your Gamertag and then below or above that you could have something like a C or a V, the C meaning crota and the V meaning the vault and then then the color of the letter could mean the difficulty, green being normal, red being hard. And then some other idea for a checkpoint symbol or color. I think that would be better then matchmaking because that's just asking for trouble and could cause problems when your trying to do the not matchmaking version with a group you always do it with. Please read this I think this will help more.