To my knowledge
a star ‘’ asterisk", is the key indicator that what follows is a system command.
There is no setting I m aware of to change that, short of a rewrite/recompile of the source code.
You should see built in commands for further reference in the wiki or the text of the source code.
The funcchar can absolutely be changed in rpt.conf, but I doubt it can be removed altogether:
funcchar=
This setting can be used to change the default function starting character of * to something else. Please note that the new value chosen must not be the same as the default or overridden value for endchar=.