can i put all 3 of the row select options on a 3-button ?
You can turn full-row selection on and off using the Set command. When off it'll use the mode you select in Preferences.
I don't think there is a command to access all 3 modes on the fly, but that seems like an odd thing to want as well.
I already have fullrowselect toggle on a button, lately I found that the mode that isn't on the button would be more useful.
You can toggle between full-row and either of the other two modes, but not both.