Question: Is there a way of refreshing the file list to only add the newly added files instead of refreshing the entire folder, where the app looks at the last file add date and just adds the newly added files.
You could sort by modification date in the windows explorer and then select and add these files with drag & pressing Ctrl while dropping.
Thank you; however, what this does (for me) is to add that/those file(s), but the file list then only reflects that new file addition. In affect, it treats it as a new file search.
Did you press the Ctrl key while dragging and dropping? This adds files to the existing list.
Yep, that did it. Many thanks, sir! I guess I should say,
'duh'. 
(I've been yearly supporter of this app and use it everyday).