Today by accident and not looking for it, I stumbled across a little 4K file by Scott Gridley. It replaces four fx_ files in the FS2004 main effects folder (back them up). It works WONDERS on the reality of the night sky!
Do a "Google" on the combination "Scott Gridley" and "strobe"... or search for "asynchronous_strobes_effects.zip". That should give you about 4-5 sources.
Hope this helps someone else make things closer to "as real as it gets".

best,
.......................john