The F1 menu is meant to match our generalized UI theme (!spray, !rules, pointshop, etc.) Along with this it is much easier for us developers to easily add settings (checkboxes, num sliders, etc.) in one central and organized file. I am playing around with new sizing and slight revision for the F1 menu to make it easier to navigate. The primary change right now is to have "TTT Settings" open up by default and move "Spectator Mode" checkbox to the top of the page.
The Guide opening-up by default and the position of "Spectate Mode" was overhauled from the original functionality of the F1 menu.