Hey,
Unfortunately, FSPax doesn't have that feature. You can request it on their site, don't know if it would make a difference. I requested it as well, so we'll see if it comes in the future, but I doubt it.
You'll have to switch hosts, unfortunately.
If you can PM me with your FTP info, perhaps I can find a work around. I haven't had an IIS server with FastCGI to be able to diagnose.
You could - but I wouldn't just yet. There's a few things with how pireps are connected to schedules, and I was waiting for people to move over to this last release to be able to de-couple that code.