Consider to change server input field to Fl_Input_Choice to give end-user access to MRU (Most recent used) server names.
See bug 445 for having a "settings-profile" for each saved server.
Upstream TigerVNC now does this. The look of a Fl_Input_Choice is very different from how most other such "recent values" input boxes work though.
https://community.thinlinc.com/t/client-interface-improvment/922