Automated paste one word at a time?

"KeyText is ""a useful keyboard macro and Windows automation program"" . It has a ""macro"" mode that might do what you want:

You can use its multiple clipboard
capabilities to make the gathering and
re-use of texts straightforward. And
online chat users will love the
""simulate manual typing"" mode!

The manual gives a bit more details:

Macro simulates typing, at the speed
set in the Settings dialog. It is
slower than pasting, but has other
advantages. The clipboard is not used,
thus preserving its contents; and if
your word-processor has auto- correct
or auto-format capabilities, these
will be available. For example, if
your word-processor automatically
superscripts ordinals such as st, nd,
rd, th etc., this will only happen if
the method chosen is Macro.
Watching
the text appear is also intriguing,
while the KeyText icon gives a visual
clue that typing is taking place. When
KeyText is ""typing"" in your text, you
can abort by pressing [Esc] or by
left-clicking the KeyText icon.

It's not free unfortunately: its price is $29.95."

"Windows has a library specifically for this called ""SendKeys"". If you don't want to pay money and you have some tech savvy read this post.

You can probably google sendkeys and find a program that somebody's written and use it. I am also assuming you're using Windows."

"If the software you write in has a long undo history:
You could write everything then do ctrl-delete until all the text is gone. Then when you want to pretend you are typing just keep pressing ctrl-z :)"