Ok, thanks for feedback guys.
Anyway it's always interesting to know about how other simmers manage their ILS flights!

In general I fly my ILS flights, obviously, according to the flightplan implemented into the FMS - However, anytime the ATC orders me to takeoff or land on a certain runway or change altitude I always let them overrule the the original flightplan (I hate to hear them yelling at me!)

Until reaching T/D I stick to my fligtplan regarding to course and altitude and let the AP do the job. Apart from the final cruise altitude, ATC always has another idea of the transition altitude which then force me to turn of my VNAV and turn it on again when the altitude again corresponds to the readouts in the FMS.

After T/D I simply let ATC take all further decisions - that is, the transition altitude, course and the runway for landing. When the ATC gives med the final runway data I put frequency and course into the FMS, hit the APP button and then go for Autoland while closely monitoring the flaps setting schedule on the FMS (among all the other stuff!). Then AP off at 200 agl.

So in practice I only need to predict the takeoff runway in the way I fly my ILS flights.

I wonder how much different you guys fly from this?  ::)

The thing is, that I actually like the fsx ATC folks and their voices (!) and I don't fancy to argue much with them!  :)