Currently when an .sp is used for seeding an iModel, none of the 3D attributes is exported therefore they are not available in SYNCHRO Control model viewer.
This led users to think that their 4D data from Pro is lost or there is no easy way to filter/ search by certain criteria (such as search for all concrete objects).
https://construction.bentley.com/6be8d325-0921-4cb5-b451-6d941fdb183e/schedule
I believe that adding the option of 'Integratino with Control would be great for letting the user to choose what 3D UFs to export. However i think this would be beneficial for all SYNCHRO imodels--both for iModels with a .sp seed, but as well as iModels built from composite models and iModel bridges