For the most part any user who is using a Pen/Tablet can easily use Blender but there are still a few inconsistencies in the navigation and functions where in the worst case, you need to constantly switch to a mouse.
For one there is the inability to scroll through certain areas without using the mouse wheel.
When opening a popup list for example when selecting a material, texture, brush, etc, you can only scroll through the window by using the mouse wheel or by typing in the result that you are looking for. But in all other menus that are not popup related, there is the option to scroll by holding the middle mouse button and moving the cursor up/down.
Adding this option to these popups or at least adding a scrollbar to the side would make it possible for pen users to scroll through these windows without switching to the mouse temporarily.
Some tools have a radius that can be adjusted by either using the mouse wheel or using the Numpad +/- keys.
This is the case for example in the Circle Selection and Proportional Editing.
For pen users the Numpad +/- keys work but are slow and awkward to use because because you have to cross your arms (depending on your layout & right/left handed) and you have to hit the keys in very quick succession for a while or hold it which created a delay of when the scale changes.
Adding an extra key like using the F key to change the radius in the Paint/Sculpt Modes could be a solution but can be equally awkward and even more confusing to use. Maybe mapping the increase/decrease radius to the +/- keys as well for the non-numpad users and make holding the key more responsive and fast in resizing is a good improvement at least.
