Read and write to a folder but not move it

We have a Server 2008 R2 file server used by everyone in the organization.  All share folders are using NTFS and group permissions, along with access based enumeration to govern folder access.  I have the groups set up with "Modify" rights to each departments folders.  We have a few departments who have bad habits of moving large folders and then losing them or forgetting where they are, etc...(typical user stuff).  At any rate, this may sound like a dumb question and I hope its not, but what specific permission set would be needed to allow read and write, but not move?  Should I turn off modify and just check read and write?  Do I need to go to advanced settings and create a custom permission set?