Gert wrote:Filebrowser is linked from the core, pagemanager is linked from the core
Not directly. The link to "Pages" is "&xhpages", the links to the filebrowser are "&images", "&downloads" etc. So other plugins can hook up on that, as it's not bound to the plugins name. But this could be solved with your suggestion:
Gert wrote:There is no problem to set $cf['pluginmanager']['external'] and use it in the core files instead "pluginmanager" ...
Gert wrote:The language string can be moved to the pluginloader ..
I would welcome that.
But after all: it might be senseless to have (alternative) pluginmanagers with additional features (as displaying version information), if no common agreement could be found, how the plugins will make this information available. See e.g. CMSimple SE: AFAIK no plugin author except Jens put a preview.htm/preview.png to his plugins.