Being new and having upsides is irrelevant. When it comes to web sites, if you don't get things 100% right, then FF looks at it, laughs, and displays it any which way it wants. It's far too strict.

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I think Long Panel is something that is either restricted to a single style, or is on every style.

It'll just be a change of, and addition of new code in the stylesheet, but to have it with every style will mean double the number of styles.

Unless some kind of hack is coded that puts a tick box in the User CP that, if ticked, changes the code in the stylesheet, or simply the stylesheet (which would still mean double the number of stylesheets), then I think it might be kept to the Liquid Violet version of Synthesis until something is done.