Hmmm let me put on my thinking cap, Commando...
You could use my script two ways to have an A-10 "fire" the nuke:
1) take out the MRV stuff in the script and use a trigger in conjuction with an A-10's waypoint to make it drop a LGB, use an eventhandler "fired" to ID the LGB, execute the nuke's script when the LGB reaches 100m AGL altitude, using the LGB's position as the nuke's target coords.
2)Keep the MRV stuff minus the re-entry flame, set a waypoint/trigger where the MRV spawns (1000m away along the x-axis), set the A-10's altitude at 1000m and exec the script when it reaches the waypoint, and just have it (the A-10) peel off.
Easy, huh?
If you can wait awhile I could do an example mission/custom script. I'm pretty tied up preparing the Sniper/Spotter script for beta release (put in some new features that will add alot of depth and strategy... ;D)