KeyText é "uma macro de teclado útil e um programa de automação do Windows". Tem um modo "macro" que pode fazer o que você quer:
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!
O manual fornece mais detalhes:
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.
Não é gratuito, infelizmente: seu preço é de $ 29,95.