Parallax only for specific symbol and control speed (too fast)

I'm testing Parallax script from Edge Commons, but I have several problems.

1. First... the parallax works only with the animations in the timeline root; if I have an animation included in a symbol, not works.
2. Second... the parallax is too fast and it's impossible to set a timetable to view out/in effect... when I scroll down in a smartphone, the parallax effect it's just finished when I arrived in the webpage's bottom and not see it (too fast).
3. Third... it's impossibile set parallax only for specific symbol... sometimes it's useful to set parallax only for a specific symbol and not for all stage... I've tried to set "EC.Parallax.setup(sym.getSymbol("SymbolName"))" but not works.

Do you have any ideas to resolve these issues?

Thanks