I make it a policy not to make unofficial changes to device firmware. These tend to be a nightmare to maintain over the log term as SONY can always issue a firmware update to mess with a hack. SONY doesn't like hacks on its reader, so it gets what it deserves...no hacks.
NO libprs500 doesn't have a GUI for editing. There's absolutely no point in making one, since there are very capable HTML editors out there that you can use to edit HTML and then convert it using libprs500.
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