My (guessing others too!) biggest pet hate on a daily basis is NOT being able to cut and paste 4 lines of Address with 1 line of Postcode from emails and other things into the separated fields on Customer/Supplier/Delivery/Quotes/Invoices etc
We got to nearly 50 votes last time I looked when I posted this same request nearly 4 or 5 years ago and we have easily been through 4 or 5 version changes/updates since then too (v26)

At best please, a simple (workaround)  'N O T E S' box on the new customer and new supplier screens to offer up a cut and pasted address from where we can (tediously) cut and paste again into the tiresome single address fields that you insist on keeping. (I get that, btw, but some help would be appreciated given that we live in the post 1999 DOS era now with people using cut and paste (and drag and drop) on pretty much every other application in the world.

As I said Arrrggghhh!!!