Is it safe to move map markers for my mod? Or would this be a no-no? It wouldn't be a far move, I would only be moving it a small distance. The Weye Map Marker isnt in the right place for my Tri-shards of Weye mod.
I wouldn't do it unless it is really necessary. Luckily the weye-marker has a ref-id so you could disable it from script and you could add your own.
You could either ask to put in ac544.enable in the console or to cast a spell (before..) with it to return the old marker if they decide to disable your mod.
Also, would it be possible to enable a sword to shoot lightning?
Initially I would say yes, but it would depend on the exact use/idea.