Every active contributor should be eligible to vote as of three months prior to the vote. Yes, not all user groups have a mailing list and not every contributor is on the existing mailing lists. Information can reach the communties through village pumps, ambassadors, and volunteers.
For uniformity and orderliness, it is okay if The Charter Electoral Commission specifies the voting method to be applied to all UGs.
Personally, 50% is cool. More is always better though
•To avoid imposing tasks, a call for willing volunteer will be great
•For selection of eligible members of the CEC, member of the MCDC and experienced community members who served in or coordinated similar roles will be cool
•Experience I’d like to see
1. Knowledge of how the electoral process works
2. Neutrality: committed to ensuring fairness without bias
3. Proper understanding of Diversity and inclusivity
4. Knowledge of electoral tools and data analysis