OS and version? Nothing wrong to kill the process btw, the blockchain and the wallet save automatically.
Not mandatory, but it adds useful functions. You no longer need to delete the wallet binary file when something goes wrong. You just type 'reset' instead.
Also, you can see your transactions easily. On v.1.0.1 you can see them only in the log. Tip: to see transactions before the update, you need to 'reset' your wallet first.