The dummy devices are still available under that single device column but you can only select one at a time. So, if you update the remote using the new software, you will have to rebuilt your single key macros using the new activity sequence feature. Currently the limits are 5 commands per sequence and 10 sequences per activity. The 5 commands can be from any participating device. So you don't need those dummy clones anymore. You can NOT nest sequence, but a device command can be a learnt sequence (under a single name command) taught using RAW mode. If you have another learning remote, then it's a lot easier to teach a sequence in RAW mode.