ship:control:mainthrottle doesn't work unless some other raw control is set [BUG]

[nuggreat]

The raw control :MAINTHROTTLE does not appear to take control of the craft controls once set unless some other raw control is also set, that being the case the :MAINTHROTTLE then controls the throttle as you would expect. Of note :NEUTRALIZE only becomes false once some other control is set and not when :MAINTHROTTLE is set.

Below is the test case I cooked up

CLEARSCREEN.
LOCAL sc to SHIP:CONTROL.
SET sc:PILOTMAINTHROTTLE TO 0.5.
PRINT "MAINTHROTTLE set to 1".
SET sc:MAINTHROTTLE TO 1.//throttle should move here
WAIT 1.
PRINT "should be false is: " + sc:NEUTRALIZE.//should be false, is true
WAIT 1.
PRINT "MAINTHROTTLE set to 0.0001 and YAW set to 1".
SET sc:YAW TO 1.
SET sc:MAINTHROTTLE TO 0.0001.//throttle does move here
WAIT 1.
PRINT "should be false is: " + sc:NEUTRALIZE.//should be false, is false
WAIT 1.
PRINT "MAINTHROTTLE set to 1".
SET sc:MAINTHROTTLE TO 1.//throttle does move here
WAIT 1.

SET sc:NEUTRALIZE TO TRUE.
PRINT "releasing controls".
WAIT 1.

PRINT "MAINTHROTTLE set to 1".
SET sc:MAINTHROTTLE TO 1.//throttle should move here
WAIT 1.
PRINT "should be false is: " + sc:NEUTRALIZE.//should be false, is true
WAIT 1.
PRINT "YAW set to 1".
SET sc:YAW TO 1.//throttle does move here
WAIT 1.
PRINT "should be false is: " + sc:NEUTRALIZE.//should be false, is false
WAIT 1.

SET sc:NEUTRALIZE TO TRUE.
PRINT "releasing controls".