a feature thats would be really helpful would be copy and paste (maybe paste into table assistant) from other spread sheet softwares. Most spread sheet applications put a tab separated list into the clipboard. I guess this would be quite easy to read out, though I'm not enough into qt to implement it. An alternative would be an assistant to import from CSV.
PS: Did you see that somebody found the reason for the disappearing OSX Menu bug? Looks like there is a new chance to fix it.