Add a command search as you type dropdown

I ran out of keyboard shortcuts, can’t remember them all anyway. Some commands I do not use very often but still somewhat regularly, those I can not find easily in the menu structure. But I still remember vaguely how they are called.
It would be nice to have a combobox in the main window in which I could type the part of a command name and ‘as you type’ the dropdown list gets filtered to the possible commands left. if i’d hit enter the first option gets executed or I could select one from the dropdown list. Please list the available shortcuts too in the dropdown list so it can be memorized for the next time.