Let me provide some more information…
I know there are account limitations and API limitations and the difference between them.
But for any of our users, if we send 15 friendships/create requests in a 15 minute interval, if we try to send another one we get rate limited (for that user). However, on apps like crowdfireapp, there is no such limitation. I’ve personally tested that I can follow more than 100 users in a matter of a couple minutes without any rate limiting, and verified the follows were successful on Twitter.
The docs mention getting apps whitelisted but there is no specific way to request it. It certainly seems that other apps such as crowdfire are whitelisted since they are able to send much more than the 15 requests/interval rate limit default for applications and, in the name of competitive parity, I would like to request the same status.