The boring things you mention are probably the ones they don't get paid for.
Over the coming weeks we've got Poppy Appeal collecting and Remembrance Parades, for the collecting I doubt there will be any uniformed staff present and the parades only because they feel obliged and for a couple of them to schmooze and ponce around in uniform trying to be important.
As for subject teaching (OK I've been doing this a long time in and out of uniform) but as said pick an area / subject you feel interested in and go for it. I've always been mechanically minded but the propulsion stuff on ultilean is far too detailed and the animations far too complex, that I refused to teach it. As for you can't do this/that I would suggest going for DofE Assessor, as you don't need a 'walking' qualification and will find yourself much in demand and if you have BELA or ML go for DofE Supervisor as well and be even in more in demand as from next year you will have to be registered to be a DofE Supervisor. These are much easier and far less demanding than say shooting and FMS, and IMO much more rewarding in terms of what you can do for cadets. Then there is the transferability (shooting and FMS are not transferable) I've been asked to train and supervise kids at school for DofE and once they've sorted the pay out, I'll be doing it for the school as well as the squadron. If you don't mind spending a bit of money you could always go for an archery ticket and potentially get it all or part-funded by the committee like ours did. Again it's not a cadet qualification so easily transferable and potentially a few quid to be made.
The MOI doesn't teach you how to teach. I went on an MOI out of curiosity and no one but no one came away knowing how to teach, but someone in the hierarchy think or thought it was wonderful and we are stuck with it. TBH I didn't get anymore, if not less, than I got out of the old Instructional Technique that I used for my Staff P2 and at Newton when I did my AWO course. They spent a load of time going over powerpoint on the MOI that you're better of just finding your way through, unless you go somewhere that has got enough PCs for everyone to use. I've done PPT courses through my employers over the years. Even learning styles etc where I work at school there is a raft of resources and most importantly TAs who have the time to work with youngsters who struggle. All we can do is try and hit a middle ground in terms of cadets learning, but then again the current cadet exams don't really require any knowledge, as demonstrated when we had a cadet pass an online exam but not having had any instruction. If anyone has the old Inst Tech sitting in a drawer somewhere it would be far more beneficial to put it online somewhere and does all you need to know about instructing, which given it was around for many, many years and no one felt it needed changing, must be a testament to its validity.
Overall Angus is correct in that the uniformed staff especially the OC have too much to do to babysit new staff, because as he said there's a lot of time and effort required for potentially no gain, as bad as that sounds. The unfortunate thing is since all of the Corps' main books went online it is bloody hard for new staff to get a handle on things and 'Bader' and it's morass of components and the way it's seemed to have spread like bindweed with no real structure, means even for 'experienced' staff it's an unpleasant experience to use it. When we had proper documents, staff and older cadets (like what I was) could flick through them to find things out and it helped new people integrate much, much easier than now. Sad to say that now the Corps is not a friendly place for new people coming in, in terms of finding things out and establishing themselves. We stand a very real danger of only being staffed only by cadets slipping into a staff role on their 20th birthday and creating a situation in-breeding, but while the Corps' systems and practices aren't encouraging to new people, that's where we are. Speaking as someone who aged out at 22 and became a CI, getting non ATC people in as staff was a real bonus to everyone.
I would say keep on with it and just avoid the 'when are you going into uniform' pressure that will happen if it hasn't already started.