Any plans for Task.SubType field being made editable and/or allowing us to use other fields to determine filtering/icon display for Tasks?  Now that LEX depends on the Task.SubType field to determine filtering and icon display.

 We have a custom Activity.Channel field that has values like  Call, Email, In-person, Mail, etc and it would be nice to be able to keep that in sync with the Task.SubType field now that there is a bit more functionality with Task.SubType in LEX. 

Upvote this idea if you also want this ability too :-) -- https://success.salesforce.com/ideaView?id=0873A000000COq5QAG