Provided are techniques for extending the capabilities of pen-based interfaces. Embodiments are provided that receive an input that can include a selection, a confirmation, and/or a completion or cancellation. According to some embodiments tension-based techniques (hardwired or software) provide an interface whereby a user can confirm, cancel, or terminate a selected command gesture. The various embodiments employ techniques that include muscular tension and/or pen contact with a screen. Also provided are spring-once techniques that keeps the tool active for one use after a button has been deactivated.