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Looks good

As a workaround, you should be able to do:

let applyConfig (c : ProducerConfig) =
   for KeyValue (k, v) in config do
       c.Set(k, v)

KafkaProducerConfig.Create(
   .....
    customize = applyConfig,
    ...
)

Which is similar to what the config arg achieves in:

https://github.com/jet/FsKafka/blob/master/src/FsKafka/FsKafka.fs#L94-L95

Looks good

As a workaround, you should be able to do:

let applyConfig (c : ProducerConfig) =
   for KeyValue (k, v) in config do
       c.Set(k, v)

KafkaProducerConfig.Create(
   .....
    customize = applyConfig,
    ...
)

Which is similar to what the config arg achieves in:

https://github.com/jet/FsKafka/blob/master/src/FsKafka/FsKafka.fs#L94-L95

Thank you @bartelink! Great to know that the customize function can be used this way. Was trying to figure that out myself. Will discuss more internally and update here if this PR would be still needed.

👍 I think the PR still makes sense either way - just didnt want you to be blocked

You're not blocked - but I would add this anyway, the function to copy over the dictionary would be redundant usage.
Just add a line about the change to the Unreleased section in CHANGELOG.md.

Looks good, thanks for your contribution!