Hi teropa,
Just one small point based on your initial post.
If I was the ATCO who received your mayday, my first instruction would most definitely NOT be to change frequency. If you get that wrong, we might have difficulty finding you again. In which case, you can forget about the rest of your scenario.
I'm not actually a traffic controller but I think I'm right ! (does anyone ever fantasize about being an ATCO
)
I have never found a working version of a Rallye100 for FS2000 so I can't make any direct comparisons between real & sim
Regards,
V.