Are there any mining pools that allow a specified amount of bitcoins to be sent to a chosen address?
You can use an online wallet to handle all of your Bitcoins.

The reason you don't want such an option in a pool, is that in case someone steals your password, they can drain your account. This is the reason most pools have a 24h waiting period between when you change your receiving address and being able to send any Bitcoins.

In the future someone could potentially make a joined pool and wallet service that will allow you to manage your earned Bitcoins easier, but that is not yet an option (I'm slowly working on it though;) ).