Both Developer Express' CodeRush and Whole Tomato's Visual Assist X are excellent tools. I've found that CodeRush has a prettier UI, and it's "marker" mechanic is extremely useful, and it has a larger palette of refactorings available. On the other hand, CodeRush occasionally makes mistakes with it's refactorings, particularly when working with C++ projects. Therefore I usually disable CR there. VAX doesn't have near the number of refactorings as CR does, but they all consistently work. VAX is also much better at unobtrusively making Visual Studio better -- doing things like improving features that already exist, instead of CR's method of almost building an IDE inside of an IDE.
Long story short, I like both tools, and would like to use both tools. The problem is that they do a few things that conflict. I would like to set things up such that whenever there is a conflict between a CodeRush command and a Visual Assist command, the VAX command "wins". Is there an easy way to do this?