I will readily admit that I haven't read the specific question(s) in detail, and may end up changing this answer (or like Tim B, post another answer) after I do, but am going to answer this in a somewhat more general fashion.
Questions on the form "does anyone have more ideas about this?", even with well-defined constraints, fare very poorly with the Stack Exchange format.
The problem is that questions on that format have a strong tendency to become very open ended. Yes, we have some questions that can be considered rather open ended. Most of the content posted on Worldbuilding SE is going to be highly speculative in nature in one way or another. One way to actually mitigate that, and help prevent questions from becoming "too broad" or "opinion-based", is to be very specific about what you want to know. "I need more ideas" in any way shape or form does not do that.
In fact, questions on that format have an infinite number of possible-answers. For that reason, they tend to be better suited for either a discussion forum (which Stack Exchange is not and very specifically aims to not be) or chat (which Stack Exchange does provide). If you go the "chat" route, I recommend taking what you have learned and turning it into a question and answer if possible within the Stack Exchange framework and general rules. There tends to be several knowledgable people in chat who are likely to be able and quite possibly willing to help you frame what you want to learn in a question which is appropriate for the Stack Exchange format.
Questions need to be specific enough that answers can be specific and judged on their respective merits. That's how voting works, and how good answers end up rising above less good answers in the end. (The bad answers are generally culled if not improved on.) If we can't judge how well an answer actually answers a question as asked, then voting breaks down; it becomes basically "I personally like this answer" or "this answer has a longer list of possibilities", which is not what voting should be about at all.
For that reason, I would argue that the type of question that you indicate, in general, should be avoided on Stack Exchange in general. They are likely to end up closed as either too broad or primarily opinion-based, depending on specifics as well as the mood of those voting to close (there is significant overlap between those two close reasons, and I personally know from experience that it's not always easy to pick one or the other). If you have a question which you feel is becoming on that format, I would strongly suggest taking it either to chat, or your own head :) and simply reworking it so that it is at least in some manner objectively answerable.
Also note that the Worldbuilding SE is still in relatively early beta. Questions ending up being put on hold and eventually closed remains a good thing, as it helps establishing the site's scope. So don't feel bad if your questions end up being closed; take the input, re-do the question, and either edit your question such that it fits within the site's scope (if that can be done without turning the question completely on its head) or simply post an entirely new question.