If users are using the frontend on the master and are allowed to just access one (read-only) hostgroup on the server80 connected to server82 the don't have any choice in the GUI and can't see the servers in that hostgroup, at all.
The main reason is that in several places the nodeid is missing as a parameter and therefore the node id
of the master is used. And on that these users don't have any rights, at all. That's right.
But ...

We took a look at the PHP sources and we think that changes are required to almost all main pages, i.e.
tr_status.php, overview.php, latest.php, etc. and that's not what we want to do ourselves.

Unfortunately, it looks like we have to