1/ Correct, you automatically receive the equivalent amount of the tLTC/tDOGE (erc20) on your eth address. We support Metamask and MEW wallet. ~snip~
Nowadays with a lot of kinds of wrapped tokens out there, why we should wrap our coins here?
Whether are any beneficial things that will we get later in your exchange platform (when it's ready)?
I am not aware of DOGE and LTC wrapping. We will expand the number of altcoins and blockchains to wrap onto, besides ETH.