I am a late-comer to the thread. Here is a thought: Given that DayZRP has multiple servers, it would be possible to require that if you die in a fire-fight, for example, that you not respawn into the same server, even if you perma-die. Indeed, why not require that you not return to the server you died on for 24 hours--maybe 48 hours if its a perma-death. Danger comes from a fear of loss. One thing to fear is having to start a whole new character (but strangely they tend to end up with much the same gear). But there is also the loss of the group play experience for a time. If, say, when you die, you had to begin again on a new server, then a) the "winner" of your last encounter actually gains some advantage, b) your "allies" would really suffer the loss in manpower, c) the next hour wouldn't be spent trying to re-gear and meet up, d) BadRP revenge play would be decreased, etc. It might also mix things up a bit, e.g players would distribute more evenly across servers and across the map.
As for the other things, I have no problem with relaxed engagement rules at night, it makes sense in an RP way--we should all be sleeping at night; anyone sneaking around at night is up to no good.