Tap

Yes. You can select multiple Rooms in Accessory settings. You can even configure the accessory to set different scenes per Room.

Yes. You can set up a Tap switch to control your outdoor lights. However, the Tap switch itself is rated for indoor use, so be sure to keep it inside. 

You can check the status of your Tap switch in the Philips Hue app: 

Go to the Settings tab.  

1. Tap Accessories. 
2. Select the Tap switch
3. Scroll down to the bottom of the screen and press a button on the Tap. Check the status indicator to see if the button press registered.
4. If the app registered the button press, the light you're controlling with the switch may be unreachable. Make sure it's connected to power.
5. If the app did not register the button press and the Tap's battery is not dead, delete the Tap switch by tapping Delete on the bottom of the screen and readd it to your system. 

The buttons on a Tap switch can turn lights on and off to a certain scene, control different lights, and more. They're customizable in the Philips Hue app: 

1. Go to the Settings tab.
   
2. Tap Accessories.
3. Select the Tap switch you wish to configure.
4. Select the button you want to customize and follow the on-screen instructions.