Thanks for the welcome.
Most of my ideas are pretty half-baked (heck, often I haven't even figured out the ingredients, never mind turned the oven on) so I'll probably stick to the Sagely Advice forum for the moment. At the moment I'm mainly interested in developing thematic, tight, one-shot scenarios that can be played in a typical 4-hour con session. So I'll mainly be asking for advice on how to tighten up the pre-made characters, the NPCs, or the overall plot structure of the situation the PCs find themselves in.
'Submissions', I take it, are for more fully formed setting elements - magic items, locations, people, societies? I may submit some of those as well,