Add additional options to Django form select widget

I have a form which I use to construct a queryeset filter. The form pulls in the project status options from the database. However, I wanted to add additional options, for example "All live promotions" ... so the select box would then look something like:

• All Promotions *
• All Live Promotions *
• Draft
• Submitted
• Accepted
• Reported
• Checked
• All Completed Promotions *
• Closed
• Canceled

Here the '*' are the ones I'd want to add and the others come from the database.

Is this possible?

class PromotionListFilterForm(forms.Form):
    promotion_type = forms.ModelChoiceField(label="Promotion Type", queryset=models.PromotionType.objects.all(), widget=forms.Select(attrs={'class':'selector'}))
    status = forms.ModelChoiceField(label="Status", queryset=models.WorkflowStatus.objects.all(), widget=forms.Select(attrs={'class':'selector'})) 
    ...
    retailer = forms.CharField(label="Retailer",widget=forms.TextInput(attrs={'class':'textbox'}))