Have you taken a look at WHMAutoPilot v3? I have a funny feeling your post is applying to V2 of WHMAP

In terms of Clientexec, it's a nice system and will do what you want. Personally though, I don't like it - it doens't work nicely with multiple windows/tabs open at the same time (keeps jumping client accounts) whereas both MBv5 and Ubersmith handle that without any problems. If you only ever need to work with a single client at once, there aren't really many other real problems with it that can't be solved with some hacks and patches from their forums.