Currently when you want to subscribe to a topic - you are forced to subscribe to "default" offset and partitions, as in Consumer#subscribe you only can specify topic names. The underlying rd_kafka_subscribe accepts TopicPartitionList that allows choosing partitions/offsets if needed. I'd like to have a way to either subscribe to a TPL directly or have a way to pass more data to Consumer#subscribe, so that things like "explicitly consume from particular offset" could be easily done.

WDYT? What API would you like to have in the library for this?