All keyboard commands are listed in the settings/controls/keyboard section. You can customize your key commands (and stick commands, elsewhere) as desired.
I dont remember the auto6 command, cause mine is mapped to stick, but it works by causing the friendly closeset to your center view to get the check6 sent to him. If you continue to tap the key the highlight box will cycle through all visible friendlies, and the message is sent when you stop cycling.
Vox is in 2 groups -- the T sends to those on the same radio channel box "v" as you are, adn the f12 key sends to all within range, regardless of tuned channel.
radio channels are set by hitting the / key, and entering the channel number desired into each box. Default "1-all" is deactivated, and most use "200" as the all country all player equivalent. Channels 2 (country), 3(squadron?) and 4 are also preset. Most squads have an mutually agreed upon channel number under 200, and icons for those sharing a radio channel are yellow.
Direct messages can be sent by typing that players handle into a radio box, and then hitting the button next to the name. Afterward, you can quick call that channel with the appropriate /, shift-/, alt/, cntrl/ or whatever.
the default for expanded text buffer is `key, which toggles.
Icon size and color can be separtaely adjusted with the GUI box in settings, which I think is under settings/video.
Good Luck!!
If you want some familiarization flights, look me up....
