Off-topic, ever so slightly:
Look at 1999, Ferrari wanted Irvine to win the title badly
This was doubted at the time. Do you know more than we do?
For what it's worth; it seemed as if Ferrari were lost when it had to work for Irvine as their number one driver, and found its feet again when Schumacher was back. That also seemed the time Irvine's performance slumped again, though I admit that might simply be coincidence.
I genuinely believe that if they didn't want Irvine to win they would have told Schumacher to scamper off into the Sepang sunset and said Irvine just couldn't keep up with him. That the switch happened suggests to me they did want to win it just as badly with both drivers. Luca DmZ knew what a WDC win would do for Ferrari back home. I have no doubt Schumacher didn't want Irvine to win though and didn't give Hakkinen half as hard a time in Japan as he could have. It all worked out perfectly for him in the end of course. Luca didn't care who won Ferrari's titles though, just that Ferrari won them.