Yes, I agree with all three Kah, they are pretty much the same issues I ponder most when playing the map phase of realms, especially the first two (actually all three!).
I didn't know how to articulate what it is that is slightly off with those three things, and probably just accepted that 'that's just the way it works' (because they are mostly things related to random spawning marauders) but yeah there's probably an easy rework to solve all three issues.
Edit- Oh you've added a forth thing
...yeah I agree with that one to... I've just come to accept that the whole 'score related to days passed' thing is staying but I've never been a fan of the mechanic, it gives me two reasons to never revisit a realm, the scoring criteria and entry fee, otherwise I would probably re-run realms to.
I still feel there's got to be a much better way of scoring realm runs but I guess it's a bit like the VP's debate for multi-player!. What would be a better alternative scoring system, I would say a score based only on achievements within a realm, that might allow things such as path-finding to not have the biggest influence on the score.