It is.
It is a good idea to wait until a transaction is confirmed before you spend the bitcoins that are received from the transactions (just in case the transaction never confirms), but it is not necessary to wait for confirmation. Unconfirmed bitcoins can be spent.
You must have replied the same time as me.
I have indeed imported some keys into my wallet.
I transferred my entire balance to my Coinbase account and deleted/recreated my wallet.dat file. An expensive lesson but it could have been lot worse.