Yes, almost any directive that can be placed in an Apache .htaccess file will work on our system. The most significant ones that will not work are those that perform access control based on IP address; due to our network architecture, IP blocking is performed before requests reach .htaccess and must be configured separately.
The most common location for .htaccess files is /home/public. By default, no .htaccess file exists, so if you want one you will have to create it yourself.