I would love more slots, but whatever you're comfortable with is okay! Like I said, all the veteran exchange mods I've asked have advised me that more fandom slots = easier modding. But I'm a fairly new exchange mod, so I definitely don't fully understand how AO3 works yet.
Either way, as a participant, I also love extra slots for freeform exchanges. Even if I only request three fandoms, my ships are usually so different I have to split them into at least two or three groups. The iddier and broader the exchange, the more slots I need—and this is a fantastically iddy and broad exchange! Six slots definitely feels tight for this exchange IMO. Like I said, I'm excited for the exchange and will make it work regardless, but more fandom slots would definitely let our ids run wilder. :D
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Either way, as a participant, I also love extra slots for freeform exchanges. Even if I only request three fandoms, my ships are usually so different I have to split them into at least two or three groups. The iddier and broader the exchange, the more slots I need—and this is a fantastically iddy and broad exchange! Six slots definitely feels tight for this exchange IMO. Like I said, I'm excited for the exchange and will make it work regardless, but more fandom slots would definitely let our ids run wilder. :D