@kuchaguangjie you can use the custom command feature @eht16 referred to for any kind of transformation like this, using any programming language you want. For example in Python you could make the up/down commands something like this (untested):

# up
python -c 'import sys; sys.stdout.write(sys.stdin.read().upper())'
# down
python -c 'import sys; sys.stdout.write(sys.stdin.read().lower())'

As for fast scrolling, a couple alternatives are to use the Page Up and Page Down keys (available on full US keyboards at least), and/or you could use the Overview Plugin to quickly jump over large ranges in the file.

If those aren't suitable and you know more Python than C, C++, or Vala, you could use GeanyPy to implement such a feature in your own plugin.

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