No I do not think you can change those icons within SOLIDWORKS or using API. You would have to use different method outside SW to do that.
BTW why you need that?
How do you set reduction to light，please
Use SetSuppression2 to set a selected component to lightweight
You need to hack the resource dll that contains those icons. Good luck with that.
I need the way that using words、 pictures、 or colors to mark parts of the FeatureManager,thank you !
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