Not at FNC. Clouds often hang over the FNC VOR, the weather clears and deteriorates quickly. Rain showers are particularly problematical. If you modify the approach to acheive a CDA towards FUN 6 DME you're not flying the published approach and could come unstuck. Stick to the published procedure and send the fuel bill to your Company. We don't have any discretion, this is how it's flown, period.