verilog-tab-to-comment

verilog-tab-to-comment is a variable defined in `verilog-mode.el'.
Its value is

nil

• This variable is safe as a file local variable if its value
  satisfies the predicate `verilog-booleanp'.

Documentation:
Non-nil means TAB moves to the right hand column in preparation for a comment.

You can customize this variable.