How do I quickly enter van driver tips?

In the Expense Processor, open the category called "Travel Expenses You Paid for While Away From Your Tax Home".  Then, click the link that says "Tip for Van Driver (Airport/Hotel Transportation)".  This will open a popup that will allow you to enter your default van driver tip amount.  If you always tip the van driver $1.00, then enter $1.00 in this field.  This will then calculate a van driver tip each time you travel to or from the airport and hotel for your layovers.

You can override the default on any day you wish simply by clicking the Record Substantiated Expense button on the left menu.