I'm not sure what browser Darchstar's 2.0.1 ROM uses, but it's got double-tap to zoom.
As for the email issue...the HTC widget worked pretty good for me. Some images wouldn't load, so I'd just go to gmail on the browser and that worked fine.
Stock android is just plain....plain lol.
Your other gains by rooting and flashing a ROM are: speed, battery life, removal of sprint apps, ability to put other apps on, even more customizability...and probably a dozen other things I can't remember at the moment lol
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If at first you don't succeed, get a bigger hammer
Running whatever release of Froyo I happen to be on at the time 
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