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We do....but we're using pure rice starch from Lineco, not wheat paste.
Take a shot glass (one of the V shaped ones, not the tall ones). Mix it 3 parts water to one part powder. Micro wave for 5 seconds. Perfect every time. We only mix about a teaspoon at a time.
I use the microwave - but like Maryann I cook Lineco rice starch. It's really easy to overcook, so go easy. Better to cook 5 seconds at a time than 30 seconds and end up with a rice pancake. Microwaves are all different. Mine usually takes about 15-20 seconds for a 1/2 teaspoon of powder to 2 1/2 teaspoons of water.
You can usually control the cooking better and avoid problems if you make slightly larger batches at a time. I use a one part mixture of rice starch to five parts water, usually measured in teaspoons. The greater vloume and mass means that it will cook more evenly and that you don't have to take it our every five seconds and watch it like a hawk to avoid overcooking.
Cooking for ten seconds at a time and stirring thoroughly between intervals make for a nice smooth paste; usually takes 30-45 seconds.