The best I can think of would be to create separate groups and add the Windows logins to the groups as desired.
The groups will have permissions based on your need.
Example:
db_datareader: for previewing purpose only
db_datareader: for users who are going to edit all the data in the geodatabase
grant privileges from ArcCatalog: for users who are supposed to edit certain data only.
The reason for suggesting groups-- you have Windows AD setup and won't have to add each login manually and setup permissions.