1. they allow wide gamut images yet?
Can you provide an example?
Sure, if you have a wide gamut monitor set to wide gamut mode and use say Firefox browser you should see that this image (hosted by Zenfolio where they do not allow wide gamut, nor did (does?) Smugmug) looks like the reds are clipped and many of the leaves are like a single shade without much detail since many of the shades on the red leaves were too intense for the sRGB gamut:
so it looks a bit duller and less detailed than say this one (hosted by Flickr where they allow wide gamut) where the colors of leaves fit inside the ProphotoRGB gamut and inside the native gamut of most wide gamut monitors:
And same for this pair where first it is clipped to sRGB by Zenfolio:
And then allowed to be seen in full glory in wide gamut on Flickr for the times you want that and trust the viewer and/or tell them how to handle non sRGB images:
(If you don't have a wide gamut gallery you won't be able to tell what I am talking about since by definition you can't see any colors beyond sRGB on it. So they will look the same regardless of the host (unless you use Chrome which has no color-management and then the Flickr ones will looks dull and ugly). On a wide gamut monitor if you use IE it automatically converts all images to sRGB and then ignores the monitor profile so IE displays ANY and ALL on the web from text to colors to images of any gamut WRONG on a wide gamut monitor in wide gamut mode, they all look radioactive. I don't think anyone ever used IE if they are running in wide gamut mode. It does makes wide gamut hosted images look reasonably fine on a regular monitor though, basically every browser at least does that these days other than Chrome (the single worst browser for photo lovers to use). But even on a regular monitor IE doesn't really get ANY images correct unless you can a fancy monitor with full 3D internal LUT and calibration since it ignores monitor profiles and doesn't make any corrects for errors in your monitor and it doesn't remap tone responses (for instance many people calibrate their monitor to gamma 2.2 but sRGB images don't actually use gamma 2.2 but something special it is close to gamma 2.2 but different, so if you use IE to view images on a monitor that has been calibrated to gamma 2.2 you will see crushed dark tones and slightly overblown contrast and potentially slightly overblown saturation and highlight curves will be slightly off too so nothing will look quite like it did when the person was editing the photo in Photoshop, which is fully color-managed and compensates for tone curve differences).)
2. you can now quickly clone galleries without having to one by one duplicate each photos and then grab each duplicate over?
Not currently, but I will put it in as a Feature Request
That would be nice to have, back when I used smugmug I put in the request, a few years ago at this point I think, and nothing ever came of it.
3. or do stuff like in zenfolio where you can upload a gallery and then re-use any of the photos, maintaining their captions and everything in multiple collections instantly (so you could say upload a master gallery of say all decent photos from a hike and then make a collection that just contains the very best few shots and then maybe another where you give people PW access to full size originals or then re-use some in other collection that is maybe best shots from a certain state or whatnot?)
Sounds like Smart Galleries is what you are looking for http://help.smugmug.com/customer/portal/articles/93308-what-are-smart-galleries-gather-photos-based-on-keywords-
Well that isn't quite what I mean, but I suppose you could use smart galleries to mimic it and use that to do it.
I guess you could add as a keyboard "best" to each of the best images contained in a completest gallery and then add a rule to draw images from that gallery having keyword best.
Although one issue I see is that it says you are allowed only five rules and what if you wanted to make a best of gallery that draw from a whole bunch of different galleries, if each gallery counts as rule and searching for keyword best is a rule I'd think you could only draw from max four different galleries? If so that would be very limiting. But I didn't read that over carefully yet, just an ultra quick peek, and maybe it wouldn't end up limited in that fashion and maybe draw from gallery so and so is only one rule and it can have an unlimited list of names for "so and so". if so then yeah I guess smart galleries would do it.
Hope this helps!