Perhaps consider an open Wiki for documentation with the only requirement for editing is that one must be registered, as it is with posting here. Given this forum is using phpBB and with that pmwiki or mediawiki (i.e. what wwikipedia uses) might be fitting.
As there is editing history that can be seen it might be easy to check for accuracy of information from within Steinberg perhaps even having developer review of what they are knowledgeable of… could also help them see a bit from the user POV.
How the current documentation plays in this is, of course it needs to be available, seen and referenced at times in user created documentation, but perhaps not directly editable???
Of course this may or not work depending on user contribution level. Documentation structure, table of contents might evolve to be more user oriented.
BTW If I want to prnt a few pages from the PDF manual, I have to first print it to a pdf (only what pages I want to print) and from there print it, otherwise that User Manual PDF is…uh, broken