Searching contacts using partial names
Searching using a first name (e.g. Thomas) usually results in a list of several people with that name (with different last names). Then you need to use TAB to select the right one. Slow and not very convenient.
Alternatively and it's the way some other apps to it, you could search using the first letters of the first name (e.g. Tho) and beginning of the last name (e.g. Jef for Jefferson).
This way you'll usually get a unique result using only 2-3 letters of the first and last name. e.g. th je usually finds the right Thomas Jefferson ;)y