Regarding Updating Amigasys... Have you heard of Grunch? http://www.geit.de/deu_grunch.html
It is a package-manager for MorphOS and 68k (I do not know if the AmigaOS-Version works) that offers easy installation and is updateable (Script). I am already working on the extension of the 68k database. I have a page where I offer a manual to update distributions like amikit and amigasys: http://www.natami-news.de/html/support.html
And I am integrating most of the downloads successful in Grunch. What do you think? Are there files missing in my list you would like to have integrated? I will try to integrate it in Grunch then.