Are you able to use mods, as in Valheim+ and plug ins on with arkserver.IO?

My understanding is that the current offering for Valheim is very, very, very early as the vanilla system only requires like 4 options. I would think you could try manually loading mods though? To be 100% fully on the informed side though I would recommend emailing the support staff as the forums are largely community handled.

Trying myself, main issue is the BinExp. The stating scripte (start server.sh) need to be wrapped and, there is no option to edit the startup script, even in expert mode.

Tried also their discord but, there is no way to post messages as there is no community for Valheim yet on the Discord page and the PM are blocked for Admin staff (which is very weird tbh) so ... waiting lol

Submit an email ticket for it, as for the "staff" keep in mind the Discord is not an official support channel, just a way to get faster community assistance. (Such as this forum post taking me about 11 hours to get to, versus the Discord that I checked about 2 hours ago once I woke up.)