I would like to replace Spacebar actions with a mouse right-click. It is much faster and more intuitive. I use 'time-sensitive right-click' in Autocad and my drawing/modelling speed is tremendous. Revit is slow because its' shortcuts are not optimized for speed. Command options toolbar should be a little bigger and emphasized by an individual border or by a different background color, something noticeable and impossible-to-miss by the regular user. I often miss command options and i have to delete and remodel things just because i missed some very useful options in that minuscule options bar.