I've added the fly command and a logblock logged superpickaxe(/spa) command, this super pick axe command basically modifies pickaxes to instantly break blocks, but other than that they act normally. This would allow you to have what is basically a pseudo classic mode outside of classic mode where you can use fly and have instant block breaks like in classic, but you can get block drops and you would have to use resources to build something.
As far as classic mode item menu, you can get something similar with the
Too Many Items client addon, while you can't use the default give command it's setup with you can use the buy command to get most items. The give-command string in the TMI config file should be set to /buy {1}:{3} {2}