I think I do recall having seen that but it's only on very old versions of the firmware. I think prior to version 4. The only catch with that - the newer versions of the firmware (the final is 7.7) fix issues - anything from head voltage issues to timing issues to supporting newer ink sets, etc.
If you want to run old firmware you might be able to find the parameter to modify with a search on the JV3 group on Yahoo.