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1024, 20480, 768 seems to be needed for me (Windows 10, Mathematica 10.4.0 and newer)
This does not answer your question about adding to the palettes menu automatically through placement in a directory structure, but perhaps it can be of use. The following code adds items to the top of the Palette Menu programmatically (it is...
not a problem, use another string selection pattern, like the following data = Map[Import[#, "Data"]&, FileNames["datafile.20.*.out", {"C:\\Dropbox\\Sims\\"}]]
No. There isn't a way that I know of for version 10. There was for 9, but it was really a hack.
All good points Roberto: Thanks for the reply. I tend to take the more cautious route with these things. Also one thing to keep in mind is that sometimes altering things that Wolfram sets up in non-editable style sheets can have unintended...