Is there a way to do this? Also wondering how to get around laterally in the MIDI note edit window on longer passages? Thanks!
Click on the vertical gray bar to the right of the Closed Hi-hat and it selects the entire row of notes; press CMD- or CTRL-c to copy the Closed Hi-hat row.
Go to the song part you want the copied row of Closed Hi-hats, press the gray bar next to Closed Hi-hat and press CMD- or CTRL-v to paste.
You can use the same selection method to delete an entire row of notes or change their velocities.
Your second question is answered in your other post.