Hi Srikandi!  <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
Fun ideas, but I think they're over the top.  If you put too much automation in a game, there's nothing left to do.  Look at Dungeon Seige!
I do like the third idea, though.  That would be very useful.  Prices could be estimated to 2 places (eg. Something like 230 or 15,000, but not as exact as 17,234.)
The last idea: again, automation.  You have a calculator!  Put the work in if you're that picky!  <img src="/ubbthreads/images/graemlins/tongue.gif" alt="" /> <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />