For the Kobo devices no jail breaking is required. In fact, KSM and KOReader (as well as a Coolreader port and some games & utilities) all work fine on the same Kobo device, right alongside the stock Kobo software.
It is best though to use a hidden folder to keep your books away from the Kobo processing. (A hidden folder is one that is named with a "." as the first character, like .Books or .Library) All the files & folders within a hidden folder are hidden as well whatever their names. If you use calibre to send your book to your device, you can use the "Save to folder" option and the hidden folder.
Luck;
Ken
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