Hi Nektarios,
Now I see were you're coming from. :-)
According to Beat's logic, you would get less disturbing "color" as long as you use the same IR over and over again - instead of using many different IRs from many different spots.
Imagine what would happen in case of a real orchestral recording: Typically, you will have your players seated in the same hall, some closer to your listening position, some farther away, each of them pointing into slightly different directions - thus interacting with the hall in many, many different ways. This is what the MIR concept is all about: There are literally thousands of individual IRs, each of them with it's own frequency spectrum, volume envelope, phase characteristics, early reflections patterns and other specific attributes.
By comparison, the conventional "AUX-send to reverb"-approach puts all instruments in the same position. The same frequency spectrum, ER patterns etc. will get used over and over again, without further distinction of any other characteristics of the dry signal than volume and (maybe) pre-delay. _This_ is where _I_ expect to hear some exaggerated “coloring”. ;-)
Beat is used to the AUX-send reverb scheme and he uses it in his own productions with good success, it seems. But there's so much more to MIR than just reverb (and “simple panning”).
AUX-sends are a valid approximation to “reverb” in a mix (and have been used since the early days of multi-track recording), but this approach won't give you much impression of a halls actual acoustic heart and spirit. Talking about “a MIR Mix” is as meaningful as saying “let's talk about the human voice”. There is not just _one_ voice – in fact there are countless pronounced, yet individual colors. The same is true for halls, be they real or virtual: Each of them is different, and each of them will exhibit sonic peculiarities which may (or may not) fit your musical needs. If you don't like what you hear, then you have to make artistic decisions: You could select another Venue, or you will at least have to make a few adjustments to “play” the hall, like you would do in case of any other instrument (and like you would do in case of any other recording/mixing approach, too).
This can be as simple as reducing the overall “wetness” in MIR Pro by means of the Global Wet/Dry Offset. You could achieve your goal by choosing a different Main Microphone position or microphone setup, or by changing an instrument's position and/or rotation on stage, or by using Room EQs for all or just a few selected instruments, and so on.
This is something that's inherent to real recordings as much as to their virtual counterpart in MIR Pro, so I can't see any unwanted “coloring” here, thus there's nothing to “suppress”, like Beat implies. Quite contrary - this is exactly what we hoped to achieve when we started with MIR's development over a decade ago, and it's one of the underlying principles of all VSL products: The colors are all there, it's up to you to use them. :-)
Kind regards,