I always have light bloom selected even back in my 2.66GHz days with no problem.
Bloom in FSX is very expensive on fps ( a little less on DX10 ), that's why we cannot enable a feature that relies on it, and forcing users that don't accept the associated performance loss to use it.
I do not have anistropic setting but "trilinear" with anit-aliasing ON. I don't know what you mean by setting 16. My displays all set to 32 for my monitor.
The setting is in your Video Card Control Panel, not in the FSX graphic settings.
Also, If I setup Marshaller with small plane so he will be on the ground, what happens when I fly my 744? Do I have to adjust him again for large aircraft? Or can a setting be attached to a particular model?
No, obviously not.
If GSX calculated that, using the stopping position for the 747 (and I really suggest having a look at the GSX manual, which explains how this is calculated, especially in relationship with the "Preferred Exit" setting), a marshaller on ground will not be visible, he will be placed on a Ladder, but ONLY if you go there with the 747. The stored height of the marshaller is STILL zero, in your scenery customization file.
However, the issue happens if you EDIT the parking with the 747 AND the marshaller was placed on a ladder at that time. In this case, the height will be saved as it was, on the ladder, which is what is happening now.