if the fuel pump can deliver a higher flow rate than a standard one then its safer and its obviously better if you mod your car as generally it would use more fuel and the stock pump may struggle to keep the pressure in the rail to allow for this.
basically the standard pump can only flow so much and will struggle if your running a high fuel pressure an uprated pump is always a safe and good idea!
The reg will be pushing out fuel more than standard and the fuel pump has to keep up with it....upgrade it to avoid the standard one giving up when it cant handle the strain!