right now, the only way to modify data from the "Activity Map plugin" is changing the source code. According to a recent incident I was told that there is no way to modify the data within processing rules (even if you select to override the values, it basically does not affect the data.
I have several situation where the website changed without notice to me and started to collect PII data (especially email addresses). having the option to overwrite the "Activity Map link" if it contains an @ would be super helpful.
I suggest to allow "modify Activity Map data" within processing rules to have more options to check (and overwrite) data in certain situations.