I see what you mean.
Well I've worked for four companies to date and none have had captains sign anything for an upgrade. I haven't given it much thought up to now because the system has been around for so long. I guess it's a good idea to have some sort of an autoland for the crew could fill out for us and then we could upgrade by referencing it. But as I said, I'm not aware of it in practice. Maybe suggest this to your fellow lineys and see what they think.