If your question involves using MotiveWave with both dxFeed and a TradeStation account, then yes.
In MotiveWave, go to Configure > Workspaces.
Either add a new workspace or modify an existing one.
Add a separate connection for TradeStation and dxFeed in the desired Workspace.
If your question involves using dxFeed as a data source in the TradeStation desktop application, then no. Neither can dxFeed be used a data source in the Interactive Brokers Trader Workstation desktop application.