KOReader is an additional reading program that you can add to what Kobo supplied as the stock readers. Your installing KSM8 and KOReader will not effect your existing Kobo software. There is an issue of how the Kobo Firmware Updates can make it necessary to use the properly updated KSM8.
KOReader includes a number of features to make reading PDFs less of a pain, but a 6" device is still Not the best thing to try and read full page PDF documents on.
I am not much of a PDF user myself, the few I do use (Like the Navy Dive Manual and the Army First Aid FM) are readable with reflow off, on my AuraHD. Hopefully someone with more PDF experience will be able to better address your questions.
Luck;
Ken
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