No, not at all... If it is needed it is a good thing. During an automated install that is driven by scripted keyboard hits and mouse clicks it will be useful (or the printed note to not touch anything hanging over the monitor).
We have had some occasions when we used ASDIS to Install things. The printed note was sufficient any time though.
Still you can, like Les stated, use AutoIT to do it, you can even utilize KiXtart to access AutoITs COM Interface.
I only was thinking of what would happen during the make of a script disabling keyboard and mouse when the scripter had a lazy day or to low caffeine level 
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