Don't fall into the trap of installing every document under your doc control umbrella...sure it would be nice to have them all done but not everyone has the ability, time or resources to do it.
I know some people will tell you that everything that you do must be documented and iff this was the case you would need to write a procedure for filling work vehicles and changing light globes. WI are a minor part in the knowledge base of an employee. Life skills, previous training (trade, licenses etc) and on the job training encompass most of our knowledge and enables us to do our day to day functions. WI should be the 5% that we do not commit to memory or a basic step thru guide to a process or action. The something to fall back on.
In saying this, you should (if possible) get the Admin people to take QA on board and adopt the same doctrine as the rest of the company. We did not take admin under the QA wing but the layout for documents, numbering, revisions etc are all the same except they look after their own docs. they are also audited thru External Accounting firms so we do not do internal/external QA audits on them. Our safety and enviornement systems adopt the same philosophy as QA but they control their own docs. (I know it would be easier if we had an integrated system but it 'aint gonna' happen as too many poeple are protecting their jobs)
