My suggestion may have been made before but I didn't see one so here goes. I would love to see a chain timer command block. Basically, it would act identical to the chain command block, however, the chain timer block would have options to set an amount of time [in ticks or seconds] to delay before triggering the next command. This would save map makers a lot time, space, and headaches from having to use repeaters/comparators.
- Choose between ticks/sec
- Set the amount of time you want
- Give it your command
If set to 120 seconds, it would wait that long before running its command and then triggering the next chain command block in the sequence. This would make me so very happy.