I will be compiling items into this thread. If you have an addition for it, start a new thread.
Keyboard Commands
Function Keys
F1 - Toggle HUD - When you remove the HUD with the F1 key you also lose the little white dot that you operated the controls with. At this point you need to face the controls you want to operate, the click the right mouse button and you will have the regular mouse cursor to move the controls. Right click again and you go back to view control mode.
F3 - Toggles the FPS Counter.
F11 - Will toggle you between full screen and full screen windowed mode. ALT ENTER do the same thing.
F12 is the Steam Capture and they go in your Steam folder structure. And they are JPGs of your screen width. Steam shots go to D:\Program Files\Steam\userdata\27035669\760\remote\530070\screenshots
CONTROL F12 is the DTG capture and they go to C:\Users\Bob\Documents\my games\TS2Prototype\Saved\Screenshots\WindowsNoEditor and they will be 4K on the HIGH setting and screen size on NORMAL setting.
CONTROL Keys
Keys CTRL + = : Switch to next cab in m.u. consist, but not into the DPU's/helpers?
Keys CTRL + 1 : Toggle floating objective marker
Keys CTRL + 2 : Toggle floating speed limit marker
Keys CTRL + 3 : Toggle floating next signal marker
Keys CTRL + 4 : Toggle HUD markers (repeated presses)
IFD Display
Finally figured this out. There are 16 keys you can actually press. The F keys and the number keys 1 through 8. Notice in the actual display screen are also 16 blocks with writing in them and they are blue. They are the Menu Items. Match them to the F and number keys position. For example Exit would F8. As you press different keys the menu items change. Just match a key's position to the item's position.