My co-workers don't understand what moderation means

Walking away may be your best bet here. However, you need to probe the situation a bit more.

It's clear the current "owners" of the community don't see your version of a moderator as a necessity to their community. That doesn't mean that they aren't open to the idea, it just means they haven't put much thought into it. If you want to transform this team, it's your job to show them what they're missing.

It sounds to me that being a "moderator" in the community is a purely social status, and it's more of a privileged than a responsibility. That's totally fine in a smaller community where everyone is mostly... friends. However, when a community grows beyond a group of loyal members, a formal moderator role must be established.

Your team needs to play to its strengths and weaknesses as a whole. I think storybuilding is a part of a great administration team, but I think you need to carve out your own niche for building "customer support" features into your game.

I don't think they need to be enthusiastic about it, only supportive. They should be willing to talk about new ideas (if they're ignoring you, that's a sign that you might want to consider leaving), but most of them probably have forgotten what it was like to be a beginner.

It's important to make a space for yourself. Get others involved. You have to sell this to the other moderators and to the owners that this "boring stuff" is important to the community, and it leads to new opportunities. Some will follow, some won't. But, you have to lead them.

It seems like the people who volunteered as moderators did so under the impression that they would be moderating the roleplaying content and not the technical or meta-organization aspects of the site.

What you could do is offer a new kind of position in your community, a kind of "admin" or "operator". Announce the position as something which is explicitly not about roleplaying but only about technical site features and site organization. The application process would also need to focus on these aspects. For example, you might want to ask for familiarity with administrating and extending the software your website is using or for web application development skills. If you would like to onboard your existing volunteers, announce that people holding more than one position in your community are welcome.

At first, there are thousand ways to moderate. Some are just for the moderating actions there, some are helping the supporters, etc...

But don't be shy to ask an Admin if you can do that, maybe he wants to test you at first, he will agree or he will disagree. If you are asking him in a nice way he shouldn't be mad. It's not rude or childish if you want to help the other moderators :)

But remember, some moderators would think that this is rude, but if you and your admin working together on this problem maybe its gonna be a good result.

BTW: I'm an owner of a Online Community (focusing on design, developing and gaming) and I would be happy if would have some one like you :) That means, no one in my team is so dedicated like you in your roleplay community. I would definitely not react like an As**** if you would ask me about some kind of stuff like that. (This is just my opinion and not a dedicated answer.)