Does any coins wallet have a feature of Import wallet (.dat file) rather than having to move it to the folder manually?
Not a big thing but would be a cool feature. Along with update notifications.
If you get the private key from the old .dat file you can import the key into your new wallet with no problems.
I think he means it would be cool to switch wallets on the fly, instead of always switching out the .dat files manually. I keep several wallets because I figure it might be safer. If one wallet is cracked, it's only some of my coins i loose. I keep my "current" wallet with a low number of coins because it's online most of the time, the others are in cold storage, except when i'm testing darksends or something

This is actually an interesting idea, and it could definitely be useful. I will look at what it would take to implement this, the issue "I" see would be having to rescan the blockchain when you switched.