I thought the "Files for a portable installation" option simply meant that you could extract a "Portable Spybot" to put on a USB flash drive, even though Spybot would also be installed on your local computer.
Well, probably entry for uninstaller still stays even if it's portable, but it is still portable I think.
1) is fixed now.
2) the portable installation just includes files that make it possible to run Spybot from a portable drive; it would still be a complete installation. An installer specific just to preparing a stick surely is a good idea, but would have to be something separate.
Just remember, love is life, and hate is living death.
Treat your life for what it's worth, and live for every breath
(Black Sabbath: A National Acrobat)
I know Safer-Networking has worked with Rare Ideas on making a Portable Spybot installer for the stable version, and maybe a Portable Spybot Beta installer could also be distributed here: http://portableapps.com/apps/security/spybot_portable