Is it possible to add 2 or more DSU Input Sources?

[matif]

I'm using the latest version of Dolphin. I found that I can't use two DSU Clients at the same time. If two DSU Clients already work on Dolphin, what I need to do to make work? If there is no such function, is it possible to add this function on Dolphin? Because two more DSU clients make people without Wiimote able to play games with 2 or more players. Thanks.