I didn't give up any important information by doing so, and I believe Keeper is genuinely trying to figure out how the Farewell mechanic works. I only have vague memories of the last game he played in (Pirates) but I'm 99% sure he was trying to do a similar thing there.
Maybe I do need to clarify, since I haven't been here in a good bit.
I play these games by learning the game mechanics, because every game has their unique twists, and applying them.
The Farewell ability is (seemingly) hidden to the player that holds it. But I'm confident there would be roles that allude to it via flavor text, and abilities to get around that anyway.
If the effects are random across town/scum for positive/negative effects, that does not rule out that they are /not/ random for an individual character. Meaning, say, I could learn a person's identity via their Farewell ability effects, which if it hasn't been made abundantly clear yet, I can see. And I know this is the case because my character is a bomb, which matches my flavor perfectly. So even though I don't know flavor super well, I can look up characters from PMJ's flavor and work from there. Google is my friend.
Or at least, I can see safe-claim Farewell ability effects. So nobody I "clear" is actually clear, keep in mind. I exist as an info dump to everyone, town and scum alike, so I'm being careful about what I choose to reveal.
I also know from my role that a person can have multiple Farewell abilities. How that effects things, I've no idea as of yet. Maybe there's a character that needs to die twice (first Farewell activates to bring him back, second one activates upon actual death).
And I assume that would be the case because, from roles that I do know, a single Farewell ability can have multiple effects, so there'd be no real reason to split effects across multiple abilities if that's the case.
Also apparently Farewell abilities don't reveal upon death? Just activated. The role specifically states they're revealed "on lynch", so I wonder if they stay hidden if mafia get them.
...This has been your Keeper info dump for the day. Now let's get pickin'.