When running a job, the normal coolant buttons in the bottom right panel are greyed out. Is there a way to change coolant state while a job is running?
Within gSender - categorically no, you can’t send extra commands/modals during a job running. Ideally, your post processor or start/stop events would handle this.
Firmware dependent: grblHAL does have a realtime coolant command (that is not present in grbl), we could consider adding it to the UI at some point but it’s a) niche so low priority and b) again, this should probably be handled by your post processor.