They are mostly kernel settings that are meant for desktop machines (miracle patch), are undocumented and/or just outright wrong. On top of that they are constantly updated, meaning your device is being used as a guineapig. As a result of that lots of machines fail to reboot after applying those "patches".
Have a look at this thread to see what happens to these devices:

http://talk.maemo.org/showthread.php?t=73315

If you want more: Just keep an eye open for "trouble-threads" on the forum here, and you'll see that lots of these devices with problems actually have those "patches" applied.

Well, ideally you should be able to simply uninstall. However, lots of these "patches" leave settings the way they were set at the time of "patching", so a reflash is more or less mandatory.