I'm now to Process Lasso and I'd like to know if it's possible with this program to batch kill selected processes on demand?
There a few ways to terminate processes.
You can of course manually terminate from GUI, or even do multiple processes by using sort or search and highlighting them and terminate.
You can set any process to "always terminate" this will never let it run, close it as soon as it starts.
You can also set watchdog rule to terminate with CPU/memory use over X time.