It would be very helpful if we could filter employees
Example:
->Filter by: Task → Choosing: No Task → Mark all → And then: Train primary skill
This would save us 1000+ clicks in endgame 
2 Likes
Yes - something like this would be amazing.
Since you already can sort employees by “no task”, which brings them all to the top, another possibly simpler option I have suggested is shift clicking. Simply click the first one, then shift click the last one to select them all. 
Multiselect Employees - Feature Suggestions - Big Ambitions Community (bigambitionsgame.com)