Parameter tableId of data loading API calls /gooddata-writer/load-data and /gooddata-writer/load-data-multi is optional now. If the parameter is not present, data load will be performed to all active tables (i.e. tables with flag export=1). See Apiary docs
Support in Orchestrator UI is being prepared. When it is ready you will be able to replace /gooddata-writer/upload-project call with one of these to speed up the loads and avoid unnecessary model updates.