Fitzage.com offers Quicksilver addicts two scripts that integrate with Highrise.
One of them gives you the ability to create tasks with various timeframes and the second gives you the ability to attach tasks directly to Cases and set timeframes.
Here's how adding tasks works:
Call up Quicksilver using whatever your standard shortcut is, type a period to enter text mode, and type the name of the task you want to create. Hit tab and type your shortcut to call up the pertinent highrise script. Hit return.Creating a task with a different timeframe is almost as simple. There is only one change. After typing the name of the task, type a colon and then the timeframe. For example, "Do stuff with so-and-so:next_week"
If you're a Quicksilverer, this sounds like a great addition.