Nah, I think that system would be an acceptable compromise, because you can keep doing your stealthy ninja stuff as long as no one targets you with their reticule, which, if you're doing your ninja stuff correctly in the first place, means it will be exactly the same as before, until your cover is blown anyways, at which point it doesn't matter if you show up on the radar for 4 seconds (or however long).
Also renamed the topic.