why would you want to send coins from wallet to main account? only to sell?! this would be a taxable event and brings lots of rocks on the road with it. i think it wont happen untill token is issued. but:
you can spend btc & eth from wallet with your visa, did you try to add your 2gether card as payment method and buy to your main with 2gether visa from wallet.
should work.

or do you want more wallets for all those other coins they offer in main account?!
this will take some time i guess because each coin wants to be managed with 100% attention.

Great potential, i also odered a card, made few deposit and worked fine.
Only one side note, i'm fairly disapointed seeing that we cannot add the coin in the wallet on the main account.