Ok, I've found a way to have the Dictaphone app permanently on your iPod, even without microphone! I'm going to post more details soon, but you have to change a NO to a YES in one of the .plist files!
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UPDATE]
Ok here's the documentation of the specific .plist:
/(your iPods name)/iPod_Control (it's hidden)/Device (also hidden)/IconState.plist
Now in IconState.plist you must select Root-->sbIconHistoryList-->Item 2-->locked--> and change 'YES' to 'NO'. Here's an image of it in Xcode, so you can see.