Well you live and learn I guess. That those timeline actions don't transfer over is something I can live with, though I had hoped a bit as it being a 'container' it contained everything. It is a bit annoying I cannot break a symbol back open if I'm not very, very careful.
Just lost a day today because I copied a symbol over to another scene in the same Hype document and started editing it, only checking that scene because the previous ones where ok, then when I wanted to pack it in for today, I review my entire document and see that the edit in the copy of symbol copied over in the other scene.
At least I won't make that mistake again. /o\