I only discovered this the other day and it's a really handy feature which will save you buying a dedicated keyboard (providing you own a remote which has numbers 0-9).
What this does is allows to you input text by pressing numeric buttons on your remote, ie. to enter the letter "c" you would simply press the number "2" three times on your remote, rather than using the on screen keyboard.
Add this to your keymap:
<VirtualKeyboard>
<keyboard>
<zero>Number0</zero>
<one>Number1</one>
<two>Number2</two>
<three>Number3</three>
<four>Number4</four>
<five>Number5</five>
<six>Number6</six>
<seven>Number7</seven>
<eight>Number8</eight>
<nine>Number9</nine>
<backspace>Backspace</backspace>
</keyboard>
</VirtualKeyboard>
