It would be great to have co-zillion site themes zipped and packaged, which could be installed in one go.

Then have a drop-down block that would let you cycle through them all to show clients. The process of presentation could be as simple as that for site themes.

I've been loading up a pile of themes over the past few days, but it's tedious to say the least.

I know it's not a big smart idea, but it would help some of us who actually build sites for clients.

Besides, I'd just love it if theme modifications were narrowed down a bunch in front of the client...if you get my meaning. Heck, it's hard enough just working through content requirements with clients.

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You are right that is a great feature. It's built in though. All you have to do is enable it.

System Admin>blocks>themes enable themes
goto preferences select the themes you wish to display

that's it.