I have been thinking recently, and know that there are similar posts out there about this very subject, but would it not be nice to enter a team-up for smaller dungeons and towers with a check mark box for you and the other to agree to enter instantly? Though I know it may not be the best idea because others may have wanted or needed to join the team up as well, but when it is late night and people are not doing too much, it is a fraction of agitation to have to wait the full 2 minutes (impatience) when you know that no one else will join!