As it turns out, you can use mouse keys to right-click. The issue is that it right-clicks on the pointer’s location. Instead, I would prefer that it right-click the highlighted file! My best option is to move the mouse pointer to the file using the mouse keys, then right-click by pressing Control-5. However, that method of dragging the pointer is awkward and slow.
Is it possible to do this without using mouse keys to move the mouse pointer so that a right-click selects the highlighted file rather than the one that just seems to be under the mouse pointer? I searched the internet but to no avail.