In the pop-ups in VSM/Subclusters in Web Admin, there are three input text fields, Agents, Users and Groups where we ask for input in the form of a space separated list of string values. These inputs are as far as I know not validated for correctness and hence admins can input invalid users, groups and hostnames. It could therefore be a good idea to replace these inputs with option-selection blocks, which semi-requires validation through tlwa_types. We already have a way of validating user- and group-names, and we could also add validation for formats of IP-addresses and hostnames.
