The challenges with doing this in a speedy manner would be very similar to why this doesn’t happen for inline annotations. Revision markings, like annotations, are a kind of formatting that would require manually trawling through piles of text, opening and closing files. It would introduce significant typing lag to add this.
@Vincent_Vincent : This said, your question implies that you currently apply the revision color to everything you revise.
I don’t think the function is intended to be used like this. But perhaps it doesn’t really matter.
As for how I use it, I pretty much leave it on for the entirety of a revision sweep—every little change gets marked. This way I know where to focus my attention in the PDF when proofing, and where I can skip over.
It’s just formatting, again, there is no software penalty for using too much italics, for example.