I fully understand your needs.
This feature already added as user feature request, the developers need to review this topic. At the moment the team focusing on the uTrack24 features.
Actually this sync feature quiet difficult on the LP-16 because there’s no dedicated sync and/or network connector, so the communication between the devices not that easy. To make a sync happens not enough to transfer the start signal from one device to the another because you can do that with the footswich today, the clocks have to be in sync as well and the two device have to wait to each other to make happen the sample accurate start.
Thank you for your input.