There is no ,s, switch for $readini .. at least, not according to the help file.
on *@:OP:#:{
if (!$readini(op.ini,#,$opnick)) {
writeini op.ini # $opnick $nick
aop $opnick # 3
}
}
However, with your writeini format, your .ini file will look like this:
[#channel]
nickThatGotOpped=nickThatOppedThemTherefore, I don't see any reason why another channel couldn't have the same opnick managed separately.
[#channel1]
Hammer=Othello
ParaBrat=Hammer
[#channel2]
Hammer=Othello