so. i'm a mediocre dd. and most of my attempts to use the random group finder either takes too much time or fails because there are too large pool of dd in the game and too little pool of healers&tanks. and it's rather frustrating.
i try to be an honest player and don't set another role for faster queuing. as i see, many players do so. no offence, i don't think that fake tanks&healers are not so much problem in the most normal and some vet dungeons, especially if they bring decent dps. but a lot of people think different. and I understand them too because daily normal random could throw you to one of dlc dungeons. and these dungeons, even at normal difficulty, require both tank and healer. or you'll have a lot of pain. like me, when daily random put our 4-dds group to fang lair...
but, actually, i don't need any group at all for the non-dlc normal dungeons and maybe even can finish solo most of non-dlc veteran ones. and, i think, most of these fake tanks&healers too. at least, some of them told me such things, when i asked.
so, please, give us a fair opportunity to finish this daily activity without insane long waiting! not all of us like to gather a pre-maid group for such a simple task like daily normal/vet. and, again, it takes time too.
also, it could be a new interesting challenge for some players.
please, you don't need to make anything special, just allow single players to use the queue and remove from it dlc-dungeons and some dungeons like direfrost keep, where you should have at least two players for clicking two buttons at the same time.
just for illustration, my solo experience in CoH1:
again, i'm a mediocre dd, i don't have bis equipment for this char and my dps in dungeons usually is near 25k. and i don't change my build for a rather long time. the whole run took of me 1 hour and 2 mins. near a half of the time was spent on the last boss, though. also, i killed all mobs and bosses at the dungeon and tried to find all the chests and heavy sacks.

it's my dps on a plain boss (- 5k dps)

dps on, err, a jumpy boss (- another 5k dps)

and my trash dps on the final boss

because it was the fourth try and i just wanted to kill it... so i slotted the second shield ability and just ran from melee-twin, while my pets were killing them both)
the main point of this experience is that it actually much more fun, then usual 4-dds farm run, which i've made a lot for that motif page. because when your group has near 100k dps... yeah, ilambris twins literally can do nothing with you, even at hard mode. but when i was alone against them, i was forced to remember they moveset and tactics and even change my own)
so, i ask you: would you like to have such an option officially?