... command line option or in the config file
1) The command line doesn't work in the console.
2)The Mac wallet version doesn't appear to create a "slimcoin.config" file. Such a file doesn't exist anywhere in the folder.
A
command line option is an option provided to the command line when starting the app from a shell.
You are correct,
reservebalance does not work in the client RPC console.
Look for the configuration file created by the app in
/Users//Library/Application Support/SLIMCoin/slimcoin.confCheers
Graham