Since support for cancellation token on user vote:
was declined and is unplanned.
I would like to implement it by myself.
However most of methods used by code is private or internal, so extending current one is difficult to achieve without copying a lot of existing methods and marking them public. It would be good make them part of public api so implementing own extension to ToDataSourceResult and ToTreeDataSourceResult would be possible. Currently it is not.
Kind Regards
Marcin