Can I assign more than one IP to a domain?
IPs are assigned per account. There is not currently a supported method of assigning more than one IP address to a cPanel account.
There is a feature request that you can vote on here:
Our feature request site is actively reviewed and curated by our development team to identify potential future build plans and accept ideas and suggestions from our community. Adding a feature request here will allow the rest of cPanel's users to vote for it if it's something they would like to see implemented as well.
While we cannot guarantee that all requests will be accepted, this is the best way to make suggestions visible to the teams that build cPanel.