for info, I am trying to test currently the use of a gconf key to limit the interval of wifi scanning and then to remove the bad stuttering when it does.
So far, I only tested this morning and it seems to be perfectly covering the issue. But it probably needs more test before making sure that this is it.
You can check the last page of the profilematic page and see the hint from ajalkane: http://talk.maemo.org/showthread.php?t=79642&page=68
And if you have some money to give, donate to him

For the moment, I change the gconf key to 0 after I found this example in http://mg.pov.lt/share-wifi