Currently listforwards returns all forwards across all channels. I think I can add [in_channel_id] and [out_channel_id] optional params to it to make it run much faster and be more flexible (eg. in my case I'm interested only in forwards for a particular in or out channel.

Additionally (while I'm on it) I could add [status] param (I'm interested only in settled forwards).

I think I can do this if someone gives me a green light (maybe @cdecker ?)