Objects Flags : some effects for only 1 object ?

Sorry.. another topic. But this one is easier, it's not about the source code stuff, but about SOCcing.
I was wondering, by looking at the Wiki, in the Object Flags page...

MF_NOCLIPTHING : The Object is partially intangible, it will pass through other Objects, but not walls. This is used for the freed animals, for example. Also used as a dummy flag for missile objects that have already exploded.

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.. is it possible to make an object react with SOME objects (I define which Objects myself), and not all the Objects, like this Flag says ?
I don't want to edit the source code of this flag and set its property to, for example, "The Object can pass through the Object 347"... I just want to know if there's a way to make the Object react with ONE object, and not all of them or a kind of them (like fire objects), without editing the flag's source code.

Or another example, this one.

MF_SHOOTABLE : The Object can be damaged. Combined with MF_SOLID, this makes it vulnerable to missiles, but not normal attacks.

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I would like to know, also here, if the Object with the MF_SHOOTABLE flag could be set to only be damaged by a certain Object.

There might be other ways achieve the effect that you wanted (although I can't think of one right now), but editing the flags isn't possible.