I think it would be a great idea to be able to target a certain location. For example, I have a dating website (imperfect-match.co.uk) which I would like to be a UK only dating website. Even though I have a .co.uk domain and a UK hosting plus have set the UK as my prefered location in webmaster tools, i still find people to be signing up from other countries. This is obviously because other countries are availale in the sign up drop-down menu. If there was a way of deleating countries or simply having an option to target a certain area/country, this would be great.