The only time I would recommend 1/2W resistors in pedals (barring tube-based ones) is for making supply voltages. For instance, sometimes you will see a small resistor like 100R in line with the power supply. This creates a low pass filter with the subsequent filtering cap to reduce noise. It is beneficial to use 1/2W resistors in those cases (metal or carbon film), but generally not a requirement. This is especially true when you have a effect that has a high current draw. If the circuit tries to drain a lot of the current available from the supply, that filter resistor will start to heat up. I've smoked a few out on occasion. But, replacing that resistor with 1/2W almost always solves the problem.