I do a lot of copying and pasting from the text on web pages or in text boxes. It would save a huge amount of time if I could use the ALT key (or OPTION on Apple) at the start of a cursor drag operation to select text to select from the nearest previous word boundary, not including the boundary character (often a space).
While the ALT key is held, the cursor drag will align to the end of the current word, not including the boundary character.
The ALT key would also work with the current SHIFT drag (SHIFT ALT: select all text from current cursor location on word boundaries) and CTRL drag (CTRL ALT: add additional text to current selections, with the additional text being on word boundaries).