I hear you, from the other side (regulator). I am sick and tired of commenting on applicant's crappy plans, and inspecting and enforcing on the same stupid mistakes in the field. I feel like a tired old babysitter whose kids just aren't growing up. (Of course, my location probabaly has something to do with it - I am sure your company's land development plans would look flawless compared to the napkin drawings I regularly review).
Similarly, I also have very little direct supervision, and am stuck in my job, for a number of reasons. What I have done to keep my attitude from disappearing into the toilet is to work on various "fun" projects in my spare time at work - all work related, of course.
The ultimate answer is to find a new and better job, though. And if I understand your situation correctly, it doesn't seem to me like you're really all that "stuck." I suggest you start looking around.
This was not a cut on regulation side engineers - although it is hard to find a real regulatory engineer - i've never meet so many people who call themselves engineers and never even went to engineering college or took an EIT, etc. I can't stand reviewers that know so little that you are having to teach them what the code/regs means, etc. Unfortunately I seem to spend all of my time with incompetent reviewers, because the competent ones review the stuff and move on. i thought i wanted to spend a few years of my career (maybe 10 to 15) doing the public sector side - a noble idea - but after working with many of these agencies - no F'in way. hats off to anyone who can put up with that environment.