[TxMt] Selecting whole "words"

Does anyone know if there is any way to manually define what TM considers to be a "word" when double-clicking to select? At the moment a dollar sign does not seem to be part of what TM thinks is a word, and I use these to prefix variable names. I seem to remember that within S-E-E there is some way of defining which characters are legit for variable names or something, is such a thing planned for TM?

Regards

Chris Jenkins

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