Hi David,
Wow, I'd better have a look at how this plugin has changed since August. Thanks so much for your thoughtful feedback!
...It hasn't changed on github, but locally the Omnibus plugin has had a lot of work under the hood; maybe not as much superficially. As often happens, I had intended to update the public version frequently, but life has kept me busy and my own modifications rarely seem quite ready to share and document. "Another one bites the dust" was never meant to stay up. Heh. It's still there in my local wikis.
I prefer the title input field beneath the text, because if I'm adding within an omnibus I usually don't want to bother with a title -- and if I do, often the title comes to me only after I've written its contents. But the input fields should certainly identify themselves clearly. This layout is specified in my "Quick" plugin,
The current (my local) version has a tiddler tagged "$:/tags/ViewTemplate" to display the Omnibus stuff after the body on tiddlers tagged "omnibus", and I have not repaired the effect that has on folding of the whole tiddler (i.e. it doesn't fold). That's on my list of things to fix, but it's after a lot of other issues that get in the way of my using my wikis. There's a snowplow effect of annoyances that don't stop the plugin from functioning that I've really ignored -- as with the "omnibus" tag, which just hasn't bothered me enough to clean up...yet.
Incidentally, nearer the start of this odyssey I really wasn't sure to what extent I wanted to use tags vs. custom fields, in general. Did I want to use several categories of tags, and have some hidden? Did I want lots of custom fields? I've become much more comfortable with the idea of adding fields to tiddlers.
As for putting the omnibus-mode icons in the sidebar, certainly that must be doable. I do sometimes have more than one omni open, in different modes (one may be under intensive construction, another could be just for reading, and another a todo list). On my current wikis, only the top omnibus shows the mode-selection icons and sub-omnis follow its setting, so it's less cluttered. I can see the desirability of cleaning the interface for publishing read-only omnis. Maybe a view-mode toolbar button to toggle the mode icons? Then it could be per-tiddler.
Cheers,
Chris