Unable to add custom RPC with the same chainID

[0xGitGuy]

This issue was somewhat discuss before #261

I get an error when attempting to add a second RPC for ethereum.

The error: Chain already integrated by Rabby Wallet

Why can we only have one RPC per chain? Metamask supports multiple RPC for the same chain. This is not only useful for dev work but also as a quick backup for switching between RPC provider.

[0xGitGuy]

"Modify RPC URL" feature is not a solution at all. Still could only have 1 RPC provider for a given chain.

Is there any particular reason for Rabby to force users to only have 1 RPC per chain since adding custom RPC intentionally checks for duplication chainID?