Deadric, if you use the restart-command, you already have a nearly complete map and docked on various stations ... but that is not the point here.
Anyways
You can still go in there and take a look - my idea is not to hack the game in a way that you cant enter unfriendly guard systems ... just a Warning beacon. Still room for exploring!
About the loss of RP ... well, maybe. I personally have never asked someone about a status of a system, and I never were asked, but that doesnt mean that this does not happen. In my experience it is more common that players enter guard systems to take a short cut or to try to get good equipment that is often selled there. A warning outside could enhance RP, because the intruder has been warned before he entered the system, not simply stumbled into it.
I personally dislike to shoot somebody just because he came across my land by accident - but I know, the SCRA is a bit more trigger-happy. :P
Replace the defenses outside the jumphole would be an alternative. But is more work for the devs.
And if the unlawfuls do not place bouys ... the lawfuls can place one for them that says something like "WARNING - This system is well-known for high-activity of pirates". A government should try to protect their people, dont they? (Yeah, and I know, you could place this bouy at every New York Gate ;))
Hey, and if there is not at every guard system a bouy, I could live with it. Actually I can live with it if there weren't any at all - would be the same like now. But I think at least at some this would make sense (the ones owned by the houses) were new-comers have easy access to it (Virginia and Braunschweig are so close to the Lanes, you cant miss them). By the time these new ones reach distant systems in the Omicrons or so, hopefully they learned enough to know this stuff.
