When doing things like Select Layer By Attribute in ArcGIS Pro, these GP tasks execute immediately even if there is some other long running GP task executing, but others get queued up. When long running GP tasks are executing it would be nice if instead of just "Run" there was a "Run Now" option so that short running GP tasks could be executed while the long running task is still executing rather than waiting for the long running task to finish (basically give the user a way to execute tools similar to the way Select By Attributes operates).