A reply from KO Propo Japan,

Thank you indeed for using product of our company.

Well, the function to set up the ON/OFF switch of TH:SPEED to BT and ET is not provided in Eurus.
Please understand the function with low frequency had to be deleted as a design specification.

Best regards,
KO PROPO SERVICE DEPT.

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I find this is a shame really to such a good product. It is a great function which I use frequently in KO Helios.

It definitely helps in traction low condition and I was able to tune it even during driving making my car very easy to drive.

The Eurus have good feel. But if the function can be included in the assign button would make it even more attractive to own one.