Hello Tamas. Thanks for the input
1. I just checked, and the visual editor does not display error-channel references for any inbound or outbound channel adapters. This was a design decision recommended to us from the Spring Integration team. I'll get it in touch with somebody on the team to see if it's time to re-evaluate that decision.
2. Unfortunately we still don't support visualizing an SI application across multiple configuration files. This has been requested before and there's a ticket open for the feature, but there's on ETA for when we'll be able to get it done.
Leo Dos Santos
Committer, SpringSource Tool Suite