It may be, I see no specific setting for it on my end. There are some config settings available to whitelist certain IPs, which I have to use so Tor Onion, I2P, Loki network users don't get rate limited since they share the same IP of the network connection they're using...

I can individually whitelist accounts which does: "Whitelisting will allow this user to bypass IP bans and some flood protections. Additionally, their IP addresses will no longer be stored." So I've gone ahead and done that for you, but no sort of global "X posts per 1 hour" type of rule to be set.

IPs are merged automatically on a cronjob schedule anyway for everyone so whitelisting really only prevents you from getting stopped by the spam filter that has no configurable settings anywhere.