@SmallGnome Hi, thank you for your suggestion, we will consider this with colleagues, however, there are no plans to implement anything similar right now.
I took a look (out of curiosity) into the available fields from the ECMWF forecast time-series set and noticed that Rel Hum is not available. Therefore, could I put in an alternative request for 2m Td (if this is available) be included in the Time Series display.