Termite is obsoleted by Alacritty. Termite was a keyboard-centric VTE-based terminal, aimed at use within a window manager with tiling and/or tabbing support.
Not going to support this, the configure keybinding PR allows for disabling of keybindings I believe which would be a lot more maintainable then adding loads of flags. Se https://github.com/thestinger/termite/pull/617
In some cases you don't want to use F11 for fullscreen mode, e.g. when using weechat which uses F11/F12 to scroll in the list of participants in a chat buffer (see https://weechat.org/files/doc/stable/weechat_quickstart.en.html#key_bindings).
In such cases it should be possible to alias
termite
totermite --no-f11
ortermite -f
.