So, there is no UI that I am aware of to the open beta standalone server, nor is there any argument to set or withdraw to start it WITH aforementioned UI.
Still, the options.lua is in the expected ..\Users\<username>\Saved Games\DCS.openbeta_server\Config\ folder - it is pretty empty by default, but it HAS the plugins entry - so what you can do is simply copypaste the Tacview options from your client. This is my whole options.lua for the standalone server now, TacView now runs without the 10 min delay w/o issue
options = {
["graphics"] = {
["height"] = 600,
["visibRange"] = "High",
["width"] = 800,
},
["miscellaneous"] = {
["autologin"] = true,
},
["plugins"] = {
["Tacview"] = {
["tacviewBookmarkShortcut"] = 0,
["tacviewClientTelemetryPassword"] = "",
["tacviewCompressionLevel"] = 1,
["tacviewDataRecordingEnabled"] = true,
["tacviewDebugModeEnabled"] = false,
["tacviewHostTelemetryPassword"] = "",
["tacviewPlaybackDelay"] = 0,
["tacviewProfilingPeriod"] = 600,
["tacviewRealTimeTelemetryPort"] = "42674",
["tacviewRecordClientsSessionsEnabled"] = false,
["tacviewRemoteControlPassword"] = "",
["tacviewRemoteControlPort"] = "42675",
["tacviewTerrainExport"] = 0,
},
},
}