Site feed question

[EnpritAblaut]

Hello,

I have more than 300 sites and i can view only 100 sites in http://localhost:8080/share/page/user/admin/user-sites page.

All sites are created by admin user, i want to disable site feed notification for all sites except 2 sites.

I have disabled site feed notification for first 100 sites displayed in user-sites page.

Questions:
1. How to disable for rest sites?
2. If admin has disabled site notification, then it will stop for admin user only or will it stop for all site members?
3. For 2 sites where i want to enable, can we specify list of users who should get notification?