How to set request url not encode some characters in RestApiClient.SendToAddress?

[Tendx]

You know I extended some Portofilio Margin Api in Binance.Net, and I found that some valid characters in client order id would be encoded in url, and then it would be rejected by regex checking of exchange.
For example, a colon ':' is valid in pm client order id regex ^[\.A-Z\:/a-z0-9_-]{1,32}$, but it would be encoded as %3A in request url if I use RestApiClient.SendToAddress. Then, exchange reject the order. I've contracted their tech support, and they told me not encode it.
However, it could be accepted in dapi and fapi, even if it was encoded.

So my question is:
May I have some options in RestApiClient , or I just avoid using these characters.