Hi, Mixcraft 2 may not be compatible with those plug-ins. I would try them for you and see, but I am assuming they are not free?
Also, Mixcraft 2 does not suppoort simultanious tracks recorded at once. BUT, Mixcraft 3 was released today and will do that and also may support your plug-ins.
Download a trial here http://www.acoustica.com/downloading.asp?p=68
It will not overwrite version 2.X, it is totally separate.