WinPilot Themal marker

I am using WinPilot Advanced and wondered if it is possible to mark a thermal
waypoint on the fly. Reason I ask is that in a recent contest I flew through a
good thermal a few miles from the next turnpoint. I made the turnpoint and
thought I had flown back to where the lift was. Checking my igc file I see I
was a long way off. If I could have marked the good spot (blue thermal) before
hitting the TP I might not have ended up in a paddock.

I know about the Thermal database feature but I want something like the "Man
Overboard" feature on some Garmin type GPS units.