Aaarghhh, I'm getting sucked in and I don't want to be!
RH, undoubtedly Sauber used Ferrari engines because they were good engines, but I still don't buy the conspiracy theory. Any commercial relationship between Sauber and Ferrari on an engine supply would undoubtedly mean income for Ferrari (on last years engines - absolute profit!!) and on the other side Ferrari would be contractually obliged to provide engines to Sauber.
I don't believe any such request/order came from Todt, but even if it did with either an explicit, or implicit threat it would be practical impossibility to execute without the danger of terrific repercussions if someone blew the whistle on such conversations.
in any case, there are other engine suppliers that could have been called upon if such a threat had been carried through.
In my view these conspiracies are too difficult to execute without the risk of getting caught.
The "win at any cost" response is a cop out; this is a big buck sport. The teams spend hundreds of millions of dollars to win - it is a large business and teams run them like a business. As such this investment means that you have better work your socks off to be faster, smarter and more cunning than your competitors, or they'll beat you.
There have been numerous threads about whether TMD, wheel rims, and whatever the next gizmo is are legal or not - ultimately the rule maker decides. If you are not attracting attention for pushing the boundaries then I'm sorry, but you are not at the front of the grid - and probably you will lose your job rather quickly. I'm not supporting cheating, but more often than not what one person feels is cheating, another interprets as great interpretation of the rules. Driving someone off the road is cheating, asking someone to block another team is also cheating, but I seriously doubt it happened and even more I doubt whether Peter Sauber would stoop to that level - I think if he had been asked he would have picked Todt up and thrown him out of the motorhome. he was also a gentleman and i don't think he would condone that sort of request! (engines, or no engines!)