What I can suggest is resetting your config back to defaults if you use the config tool or if you used FTP, you can delete it and then validate the server to restore to defaults in your control panel.
The config can not be replaced or edited entirely. Some values can not be changed. Please check our wiki for more info.
https://survivalservers.com/wiki/index.php?title=7D2D_Server_Config#World
Items can be dropped by hitting O on the keyboard I believe. Also, buildings can only be placed after unlocking the engram for it and having the necessary materials. If you have not played Ark before, you may want to check YouTube for tutorials, etc.
The latest update has been causing issues with Darkness Falls and would recommend waiting for an update from the mod developer. Otherwise, yes our servers support mod installation.
It would be helpful to also include your question that you are looking for help on so others can reply constructively. If your concern or issue is account specific, please submit a ticket and we will assist you!
I am not sure what you mean by pgs. You may want to check into mods as I am not aware of any parameters for this. https://survivalservers.com/wiki/index.php?title=ARK:_Survival_Evolved_Advanced_Configuration#Events
This is a setting in the gameusersettings.ini. For more info, please search on this page for "share" and you will find the correct parameter. https://ark.fandom.com/wiki/Server_configuration