Not new, but present in 2151:
With the following settings:
"detect_indentation": true,
"tab_size": 2,
"translate_tabs_to_spaces": true,
"trim_trailing_white_space_on_save": true,
"use_tab_stops": true,
If I press tab, it inserts two spaces, and if I press (backward) delete, it backs up two spaces. Great.
But if I press tab, go to the beginning of the line, and press Fn-Delete (forward delete), it only deletes one.