In that case there is a much easier way
presumably on the original remote 2 = abc
so one press is 'a' two presses is 'b'and 3 presses
is 'c' etc

all you have to do to convert to a full querty
keyboard is to download the keyboard that you
have seen and asign the buttons as follows
key a = 2
key b = 2,2
key c = 2,2,2
key d = 3
key e = 3,3
etc etc with the other keys.

depending on the resonse time of your system it
may actually need to be

a = 2
b = 2,delay,2
c = 2,delay,2,delay,2

this is because The pronto will be capable of
sending the sequence much faster than you could
hit the 2 button 3 times so without the pauses
the system might not be able to respond fast enough
or ignore some of the signals thinking you had
just held the key down to long accidently.

If you do it this way you definitley want to think
about using aliasing to program the keys and possibly
for the pause as well. It will save time and memory.