I would say they're no "easy" way.
 
We once spent a bit of time trying to figure out if we could use the EDI module to import SOs from data generated by our website, but never got anywhere with it.
 
I'd be pretty sure you CAN do it with EDI but will take some time and preferably experience to do so.
 
As for bar codes, yes a simple wedge scanner will input any text/number it reads into whatever field you're in for both Evo and UWS.
 
Entering an email address at the SO level would have to use an already existing option, such as the Notes feature. You could set up a Note Type of Email and add it to the SO level. Pulling an already existing email from the customer info will be tricky unless you only have one email address per customer and always have them entered the same way.