When a new student (or parent) contacts me about oboe lessons I first ask about the oboe; if they haven't rented one yet, I tell them to get one with the left F (if it has that, it has have the low B-flat, or so I've found, and so far they've also had the F resonance key). If they already have an oboe with missing keys I give them a few months to replace it.
After using a Linton (yikes!) for a short time, I moved to a Lym in my early days. There was no left F, and the fingering books all had me using the E-flat key for F, of course. I can't tell you how difficult it was to get over those fingering problems. (Even now I sometimes struggle with left F!) So I explain to my students and parents about my situation, and tell them I'm doing them a favor.
I use the Gekeler (and to the horror of some, the Rubank ... for my young'uns it is often better because it moves slower). Gekeler, at least when I last checked, which was a few days ago, doesn't use left F. I change the fingering charts the minute I can.
What I'd love is a book that teaches "fingerings first" rather than keys. For instance, rather than learning the G major key with F#, I'd like to teach F#/G-flat. I'd like to test my system out and see if students have less of a struggle with certain notes ... for instance, they learn B-flat long before A#. When they finally see and A# they tend to get confused, and often play an A-flat, which they learned earlier on.
In any case, it's this idea I have, and I'd love to give it a go sometime. I could be all wrong; perhaps nothing will help with these little "glitches" some students have. But I figure it's worth a try! So eventually I want to start, with the help of the Sibelius program, putting together a beginning book.
When I'm done with my other projects, maybe.