There is some definite language you can add to make it stronger. I didn't see anything in there with regard to minimums. As I mentioned earlier, there are no reprisals if you come forward with an allegation or you participate as a witness, as long as you do so in good faith and you're not vexatious about the complaint.
There are exceptions that can be put in, as mentioned earlier, with regard to the proper exercise of management rights not constituting harassment or violence in the workplace. There are definitely gaps in there that could be filled.