I seem to recall @NiLuJe and @geek1011 mentioning they were working on something to do with the kobo plugin system, but I don't know where they got with that.
Otherwise, I don't think anyone's figured out how to add stuff to Nickel (the main Kobo application). Those examples you mentioned are VERY old. I believe Nickel has changed a lot since then.
Thus we have the kludges that are fmon/kfmon/KSM...
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