I am fixing the Issue 2.
The Issue 1 is an intentional behavior. Similar to the Select Word command (ALT + F8), EmEditor will try to select the right-side word if the cursor is at the right side of the space/tab, or select the left-side word if the cursor is at the left side of the space/tab. I believe most users would want to select a neighboring word rather than a space/tab. If you would like to select a space/tab, you can use SHIFT + RIGHT or SHIFT + LEFT when the cursor is at the left or right-side of a space/tab.