If you have embedded audio and video the need to have multiple tools available is probably greater than with embedded images.
For embedded images 95% of what I need can be done with Irfan View, only occasionally would I reach for PS or Gimp. But for audio and video I might use 2 or three tools on the same file consecutively. That said I'll probably always prefer to edit the audio and video outside Sigil and add the result to the book.
On Windows I think the folder presented for program selection is the one in which the current instance of Sigil is located - so if your running 64bit Sigil you're unlikely to see folders for your 32 bit or portable programs; this may confuse some users.
I list of previously selected programs would be nice, I suggest with the most recently used at the top.
BR
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