Perhaps this will already be covered in the upcoming Javascript post-processing functionality but otherwise it would be a nice thing to add.

It would be nice if we could do a simple search/replace on values.
For instance, a check returns "ok" and "failure".
In such case, the Zabbix Server should be able to replace it to 1 or 0 instead so it can properly be matched

Now, the output should be piped through something like sed to replace the values before feeding it to the agent. It would be nice if Zabbix could deal with this, just like converting from HEX to DEC for instance.