T5: classification using text2text?

Sorry for the topic steal, wasn’t getting a lot of attention on my topic on T5 ( Yet another question about T5 prefixes: are they special? - Models - Hugging Face Forums).

Has anyone here used T5 for regression? From the paper that @valhalla links, it seems that you could rebase your continuous labels to 0-1 and then use the output of the softmax for one of two options (e.g. true and false) in a MSELoss function. Or is that a nonsense suggestion? The caveat is that it is not always possible to rebase your values to 0-1.