hint3:
it seems the best (i.e. least confusing) practice is to have only two mainly used configurations, e.g.:
root@kopiemtu:/etc/kopiemtu# ls -lt
total 16
drwxr-xr-x 2 root root 4096 Nov 19 12:52 templates
-rw-r--r-- 1 root root 109 Nov 19 12:51 miner.conf
-rw-r--r-- 1 root root 109 Nov 19 12:51 eth.conf
-rw-r--r-- 1 root root 109 Nov 19 09:39 etc.conf
root@kopiemtu:/etc/kopiemtu#
and to switch whole farm imediately from one configuration to another - by single command 'mmih' from master rig
(here: switching between ETH and ETC)
mmip; mmih; mmit
but in case of ad-hoc necessity - one-time mining event (eg. for LBRY) can be made by such combination from master rig:
mmip
mm "cp /etc/kopiemtu/templates/lbry.conf /etc/kopiemtu/miner.conf"
mmit
Next 'mmih' - will override miner.conf and situation will change back into the starting point.
Nice! Maybe some direct command to switch coin eg: mine switch zcash or mine switch lbry etc. Also from master rig: mmis zcash etc... ?