OK, dunno what you're reffering to cos I'm too lazy to read the thread, so I'm guessing that what you want is this:
when
>
distance
Alpha
Node
350 (assuming a node is 700m wide)
no-warp
Alpha
Set this event to repeat every few seconds. With retail FS2 you can only set 999 repeats, but like I say Open can (or soon will) allow you to specify infinite repeats. Then you want:
when
<
distance
Alpha
Node
350
allow-warp
Alpha
Again, set many repeats for great justice. My FREDding's a little rusty so I may not have those SEXP names exactly right, but you should gte the idea. And they should work, in theory. On the off chance that you can't tell Alpha wing to no-warp or something, you'll need to set up events for each member of Alpha individually. Just make sure you get the < and > symbols right, they're a common cause of misfiring SEXPs
