Perhaps, in that case, you could reach an agreement with your boss to have some time away from the office (perhaps work at home time) to go through some of the courses?  Set things up so that either a co-worker or the boss would be able to "filter" requests, so if a true "ohmygodohmygod we need this fixed yesterday" emergency comes up and you're the only one who can handle it, they could get in touch with you, otherwise they'd either deal with it themselves, or tell the requestor "come back tomorrow."