Share features across multiple definitions via grouped syntax

[nbubna]

This is unlikely to be worth the considerable effort it would probably take to implement (i.e. a complete rewrite of the parsing code). But in those few instances where you are registering multiple, related handlers, it might be nice to do things like:

Eventi.on('group:{type#tag other$1}#tag2', ...);
instead of
Eventi.on('group:type#tag#tag2 group:other#tag2$1', ...);

Just dropping the idea here to keep it in mind...