@Skimmer
Do you think I should maybe just delete current smoke sys and add your heat shimmer
What I'd do Skimmer is
just comment out your existing [smokesystem] entries and then insert the heat shimmer entries. That way, you can check out if you like it or not, and easily and quickly revert back to using your regular [smokesystem] if you wish.
If my memory serves me correctly, I think the sonic boom effect is all handled in the [lights] section, so you shou;dn't have anything clashing with that (I think).
NOTE: There
is a way to have multiple independent [smokesystem] effects. I used the concept to good effect with the Blue Angels C130 that I posted a few weeks back. If I can find the time to work on it I can maybe try to work a series for the Hornet.
If you want to try experimenting with the concept yourself...here is a link that shows how it's done...
http://www.fsdeveloper.com/forum/showthread.php?t=14592