you can irreversibly lock down those functions. just read the UIA creating stuff in the client
Which function can lock the max amount so it can not be changed ?
I don't think there is a flag to lock max amount.
An alternative is to change the owner to null-account so that no one can change any parameters of that asset any more.
Whats a null acount ?
"null-account" is an account which controlled by no one.
"BTS" asset is owned by "null-account".
Try "Explore -> accounts -> null-account " in the GUI, or try these commands in CLI:
get_asset BTS
get_account null-account