Good morning Ian
You have a number of questions here, so let me see if I can take them in order:
1. Should you submit to a differnt category.
The answer is almost always no if your goal is to get seen by an editor sooner. The reason the answer is no is that if it is not the single best category you will, in fact, have spammed the directory by wasting an editor's time, forcing them to have to figure out where it should go and move it there for another editor to review. You gain nothing with this strategy, and could actually lose time. So, thanks for asking before doing!
2. Volunteer to edit this category question?
While our most excellent FAQ addresses this, let me give you the short form. Every category has more than 200 editors who are allowed to edit there. The thing you saw is a recruitment pitch, indicating that this might be a good category for a new editor to apply for. We do it this way because we can't afford radio and TRV spots <grin>.
3. Hardly worth submitting question.
It is certainly worth submitting once to the single best category, and, if after a year or so passes, and you have improved your site (I haven't looked, this is generic) we allow you to submit once more to the single best category.
Hope this helps.