DeleteOldMessages: PHost does not keep old messages. There are no plans to support this feature.
'con' and 'noc' Friendly Codes: When asked for its configuration using the con friendly code, PHost does not respond with messages. Instead, it will include pconfig.src in your util.dat, as a file transfer record. Since PHost never sends its configuration when not asked to, the "noc" friendly code has no effect.
VPA Extra Features: HOST 3.22.036 has a switch "VPA Extra Features" which permits some actions not doable with planets.exe or older Winplan. This switch is not implemented in PHost, see AllowVPAFeatures for details.