i only used the saveeditor for gold cuz i cba to grind, i think it was originally caused by some quest conflicts. cemetery rumors was also left incomplete after saving the 3 vampires. maybe there was a dependency on that? after i forcefully progressed the wedding wrecked quest, the cemetery rumors quest also completed after talking to victoria for some reason. so far no other bugs from doing this method tho.
Savediting gold doesn't effect any quests. Cemetery rumors only concludes if you either kill them with sun (I have never done that) or only after you take over the vampire masters castle with Oksana. I think the theory being that they still live in the cemetery until you take over the castle.
I can say editing with Gold doesn't effect it because I have honestly played about a dozen or more playthroughs editing much more than gold. Including affection and experience stats.
Peasant's Quest is pretty resilient towards editing variables, I think you have to start editing a crazy amount of switches in order to bork your save. And even then I still edit a few switches ever playthtough. (Instant Pickyuprock is much better than waiting for RNG.)
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I use the RpgMakerSaveEdit program instead of online, just because I find it handier and don't have to upload several files / deal with countdown timers.