'Run load test' is not a simple single step, it includes many tasks, may machines involved .. like getting information from ALM, checking for available timeslot, host machines, lgs, and many more .. it is impossible to run a test manually in the PC.
Use LR if you simply want to run a load test. Use the command line parameters of controller process wlrun.exe to launch a load test.
If it doesnt answer your query or completely different, please elaborate.
I hear what you are trying to say its not so easy as it involves lot of initialization steps which takes place when we trigger execution from PC.
However I know the fact that it is bit complex to execute the test through command line from PC. Whereas it is way simpler running command line execution on LR (Standalone). Still I am curious to know if at all we can get the command line executions triggered for PC. If you have the steps please help. I am aware you made a comment that it is impossible but is that true statement?