Mike,
There is another app that @jocover developed that’s called ‘FooBar 2000’ that performs transmit only using AM and FM modes (CW LSB/USB are in development). Check this thread for more info -----> LimeSDR Transmitter plugin on windows .
Also, @SimonG4ELI is developing a means for transmit for the SDRConsole application, too, but that’s awhile off yet before we’ll see that for the LimeSDR.
Hope this helps - 73 de Marty, KN0CK