Appreciate the replies, especially this one:

Originally posted by Yakumo_2020:

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EDIT
quick search turned up this one
https://www.nexusmods.com/valheim/mods/159
auto wood for kiln and coal/ore for the smelter

Thatnks for mentioning this, I never thought to look for it before.

Definitely going to try this out.
I generally don't use mods since i want to maintain the intended balance of the game, and I feel that Valheim is mostly good as it is, apart from the smelter mechanics, so it's excellent that there is a mod mostly addressing that!