Change Colour of Objects

I recommend that, too!

Coloring objects seems an easy way to highlight a specific meaning. And often, designers define multiple colors for various meanings, maybe explained in a text box shown in the respective models. The downside of doing that is that analyzing and finding such objects becomes very hard.

I think such desinger/modeler behavoir happens quite often when they believe that a change request for the modeling conventions would be too much effort. Maybe that is really so, but then make it easier for them to suggest a change with lower hurdles, e.g. offering sandbox areas trying out their intended changes in all possible cases, and more importantly, testing against the as-is modeling conventions whether their intended/extended meaning doesn't have negative side effects, or even overlaping with other (yet unknown) methods you have already agreed on.

So, if object coloring isn't temporary or exceptional, but becomes an intuitive way of designers to express a regular pattern, then rather think about deriving an object type to support their need to destinguish the meaning between the two objects types. That preserves the option for architects/analysts to properly evaluate processes by scripts, queries, manual searches etc.

Cheers
Runè