After some experimentation I posted this:Incorrect. I programmed my Harmony One to do it.
So on that count I was wrong, having missed the fact I could use number shortcuts.... I do have to retract something I said earlier (can't edit my post). I managed to get my hopper captions macro down to 5 steps, so it should theoretically work on harmony.
However, you cannot change the delays between sequence steps. You can only change the global inter-key delay. So if you have to slow down one command, you slow down everything for that device.
Someone else mentioned the hidden sequence capability on the 700. True, but it is very well hidden and requires the use of the old 7.7 software and costs you 2 devices, making your 8 device 700 only capable of 6. When you buy a 600, 650 or 700, the included instructions tell you to use MyHarmony.com to program your remote. So the average user would have no idea the 7.7 software even exists or how to install and use it. Sequences are still completely missing from the 200, 300, 900 and 1100.
So enjoy your 5 step sequences while you can. In the mean time I'll enjoy my unlimited length sequences, with variable delays per step on my remote that cost about 20% the price of a comparable harmony.