DGB->USD
Thought I was replying but was actually editing a previous message so in case you missed what I was saying.
The android wallet actually already includes that feature. It could use improvement as it is currently tied to btc-e and cryptys for the required data but once we are on cryptys a small update with our market id will turn it on and give you your balance in USD among other fiat's. Adding in more source options for BTC->FIAT would also be good. I personally would prefer the info from cavirtex where I'm Canadian.
This is lower on the priority list though but will eventually be looked at again and improved as we get more reliable sources of data.
A good example of why I should have downloaded the Android wallet and tried it before I opened my mouth

I've used it before, and missed that feature... I guess I should pay more attention to things
Didn't coinmarket.io say they would be willing work out a way for them to display the latest prices with coinwarz at some point in this thread? Maybe you could get in contact with them and integrate their exchange rates in the wallet... I'm probably going to continue using coinmarket for a while just because of how simple it is, and how easy the interface is.
As for the fullscreen merchant idea, I'm glad you like it! I've been thinking for a while about the best ways for small businesses and stores to accept crypto would be, and that's what I came up with.