The system enforces specific memory limits per service, so you may want to check the logs if it's not simply pmond having killed it out of spite

.
But that's just for science, that won't really help you if memory usage keeps growing for real (you can tweak pmond's quotas [it's not fun, but you can], but if there's a leak, the OOM killer will eventually take care of it, so, not a solution).
Since KUAL is a launcher, you can of course launch a specific action/params pair yourself, just look at the json of the specific extension you're using.