I believe it would be more beneficial to add more specified keyboard shortcuts. This could be done in 2 ways.
1) Adding compound shortcuts such as Alt+"letter" in order to make it easier for more experienced users to navigate
2) By making it so that when you enter certain areas (E.g. When entering sketch mode) There are new shortcuts available for just that areas.
As you can see there is very little in terms of shortcuts for the sketch environment so i believe an increase of them during or out of the environment will greatly increase the usability.
Let me know if there is already a post like this or any suggestions,
Thanks