Searchable Customisable fields

Searchable Customisable fields

Is there a way to make custom fields searchable?

I would like to be able to quick search or used the advanced search function to find contacts by fields such as 'Job Title' or 'Sector'. 

You can use these fields when creating a segmented list - is there a way that this functionality could be extended to the main search bar? This would be very useful to me.

Thanks