Templates currently need to be in groups which should be changed for this to be possible. I'd like to see that all Templates linked to a group are being applied to all the hosts in that group.
This makes it easier to link templates to hosts. Have a standard webserver? Apply Webserver + Linux + .... to the group, put the host in the group and it receives the templates. If it is removed from the group, so will be the template linking to that host unless it is in another group with that particular template.