Two simple queries:
Am I correct in thinking that of Wakaba, Kareha and Kusaba, only Kareha can have dynamically generated 2ch style "show last 50 posts" (eg http://wakaba.c3.cx/sup/kareha.pl/1192108766/50)? I was looking to integrate most recent posts embedded into other parts of the site using this feature, so it seems only Kareha will do using this method.

Particularly in Kareha, is there a simple way of flagging a thread undeletable, so it could be left alone at the end of the board without any danger of it being deleted? I was looking to tie certain threads into the site, so I don't want them being deleted.

Thanks.