Ctrl + shift adds to the shelf. I know if I double click I get the options, but that is only if say the related objects is selected. ie the vert have to be selected before i can double click the option box otherwise nothing happens. The prob with that is that the current settings are applied to the verts with the first click so when the option box pops up with the second click I have to firstly undo the last command then alter the settings. I guess there is no current hot key work around at the minute