Hello groovyd,
Unfortunately our in-wall motion sensors do not offer a bypass feature to indefinitely stay on until it is manually switched off. We do offer products that may solve the times that you are just outside of the sensors range, however this would be achieved with two components. The Maestro Wireless in-wall controls have the ability to link up to RF transmitters, which include motion sensors (wall mounted 180º or ceiling mounted 360º), remote controls and daylight harvesters. The transmitting devices are battery powered and rated to last 10 years before needed to replace the battery. Model numbers that could work for this application are as follows.
Maestro Wireless switch: MS-8S-DV or MS-8ANS-120
http://www.lutron.com/TechnicalDocum...ry/369-143.pdf
Motion sensor: LRF2-OCR2B-P (ceiling 360º), LRF2-OWLB-P (wall 180º) and LRF2-OKLB-P (corner 90º)
http://www.lutron.com/TechnicalDocum...ry/369432a.pdf
http://www.lutron.com/TechnicalDocum...69481a_ENG.pdf
Please let me know if you have any questions.