Can I say this?
[source::/usr/local/blackboard/*]
TRANSFORMS-routing=otherRouting
In my inputs, I have pretty long list of such files, some with wildcards themsleves... Can I route all of it with one stanza in the props.conf.
Yes. However you should note that "*" only matches with a directory segment, so if you want files within subdirectories to be routed, you should use "..." instead.