I've seen a few references in threads to patches, scripts, or other tricks to keep or re-apply your custom dictionaries when you do a Sync. I tried searching old threads for instructions on what to do, but I think most of the posters were writing for people who know more about the internals of the Kobo than I do.
It also worried me a bit to find that the post for Kobo Patcher (which was referenced in some of the custom dictionary threads) hasn't been active since 2014. I may not know that much about Kobo internals but I know that using the wrong patcher is generally a problem!
Can anyone point me to a post or other instructions on how I can keep my custom dictionaries after a sync?