Right now there is only the option to choose specific users from group. An extra option for assigning to all users of a group would be nice.

I'm currently settung up an invoice approval process for a corporate group of multiple countries. So I have roles for each country to hand out search and display permissions.
To allow workflows to assign tasks to approvers and accounting, I have to create roles for each instance e.g. country A needs approver A and accounting A, country B needs approver B and accounting B.

Except for their use as targets in workflows they do the exact same thing. As in the beginning: If one could use a whole group as a target for workflow assignment, it'd be enough to only have one general accounting and one general approval role instead.

This will make maintenance on workflows, joiners and leavers and bugfixing much easier.