I found that Tab controls can be switched using arrows, but the Ctrl+(Shift+)Tab is just the case when it significantly speeds up the control of a window, as well as for example tricky F6
I also agree there is no need for _ on each of plenty controls, if they can be accessed using TAB. But in small and easy windows, like personalised status, it simplifies user tasks.
btw. is there any /command for preferences or personalised status window?
oh yes and one imporant question, but maybe a little bit off-topic
can the AutoComplete feature be done for command list?