Question: Is the default PIM message rate limited to 100, even if the option of "message rate" is disabled?
(GUI appears to show this value even when option is disabled)
Answer: There is no default rate limit of 100 if the option is disabled, the PIM device can transmit at the maximum possible rate it can achieve.
(Verified with 4.15 version running EDM-2003B)
It could be 50 or 500 or any other value depending on the PIM configuration.
(I observed different values for different configurations, but not at all limited to 100)
When the option is enabled, the possible rate is limited to the configured value.