I've looked at the help and I've googled, and I find plenty of reference to the fact that you can use control+click to send a right click. That's great and works just fine, but it's not what I want to do.
I want to send control+left_click. This is important for being able to make discontinuous selections in things like Windows explorer, Excel, etc.
Chicken of the VNC doesn't seem to provide a way to send a control+left_click without translating it into a right_click. What I might suggest is since you translate Command into ALT, then you could translate Alt/Option into Control, although that seems to correspond to middle-click. Also, there should be a way to disable this translation entirely--I use two-finger-on-trackpad+click to do right-click, so I can do without control+click to get right_click.
Oh, and if this function is already available, please add it to the documentation.