Could be improved?
Code:
on !*:join:#: {
  writeini -n sys/join.ini $chan TOTAL $calc($readini(sys/join.ini,$chan,TOTAL) + 1)
  writeini -n sys/join.ini $chan $nick $calc($readini(sys/join.ini,$chan,$nick) + 1)
  msg $chan  $readini(sys/join.ini,$chan,$nick) - $readini(sys/join.ini,$chan,TOTAL) 
}

join.ini
Code:
[#channel_1]
TOTAL=100
mur_phy=5

[#channel_2]
TOTAL=53
mur_phy=10