This is a bigger change than that. Used to be, spleen items were categorized as "usable" by KoL. We would mark them as "usable" or "multiple", and kept the spleen effects in spleenhit.txt. Now, KoL categorizes them as "spleen item" - and we should follow suit and mark such items as "spleen" - or "spleen, usable" (if the default is use multiple and this one is single use) or "spleen, multiple" (if the default is single and this one is multusable).
We keep spleenhit.txt - just as we have fullness.txt and inebriety.txt. All three files already have a column for "quality", and adding the qualities to spleen items will automatically make them display in the correct colors, I believe.
And then make "checkitems" and the new-item registration code parse the new format and generate the new formats.
And finally, do a full "checkitems" to generate the data files with the changes, and voila! It is done.
It's a project. Not huge, but not trivial. Unless somebody steps up and says "I'm doing it", I'll start it in a few hours.
Good thing they didn't add more data to item descs - like "Restores 8-12 MP" or "Restores all HP" to restoratives. That would be more stuff we'd need to parse and use for our data files.
Oh. Wait. They did that too.
That deserves a different New Content thread.