Sorry, not RollerBall!

Look in the [lights] section of the aircraft.cfg - you'll see something like:

[LIGHTS]       
//Types: 1=beacon, 2=strobe, 3=navigation, 4=cockpit, 5=landing
light.0=3, -21.2169336, -46.0427472,  3.9828912, fx_navredm ,
light.1=3, -21.2169336,  46.0427472,  3.9828912, fx_navgrem ,

The three values give distances in feet from the reference datum (horizontal, lateral, vertical), with the effects file for the light at the end. Change the figures until you get the light where you want.

Bingo.