I couldn't really care about an android app that won't stake, but an in-wallet trading feature would be nice.
A staking mobile wallet is unlikely to get used for staking for a number of reasons. The biggest reason is battery life. PoS is designed to distribute staking weight over time by creating two new inputs from each old input. With the splitting, though, the weight of each transaction goes down, making the wallet work harder after every cycle. Eventually, mining dominates battery usage and the user must shut down the wallet to save battery life.
In-wallet trading, however, is an awesome idea. I'll bring that up with the team. Suggestions on which exchange to support are welcome.
A staking mobile wallet is unlikely to get used for staking
Don't agree as phone is on charger, usually overnght, and I know of at least 1 mobile staking wallet that is very easy on the battery.
A coin with 20% interest should have mobile staking if the plan is to make it a usable currency. JMO