HP 50g -- too shifty?

[John Casper]

1)HIST key-I am used to pressing top arrow therefore I don't use this key.I use it for CST,
2)MODE-less frequently used key.I use it for PICK command
3)SYMB and APP-rarely used
4)It would be better to have more UNDO steps(Is there any program)
5)Left arrow shows Graph-Its better for using CST