Well... I finally made some.
To make Rice Buns: Cook glutinous rice as usual. (Methods are slightly different depending on whether you are using a rice cooker or not. There are many websites that explain how to cook rice in each instance.) Let rice cool enough that you can handle it without burning yourself. Fill a bowl halfway with water and add some salt. Stir until the salt is mostly dissolved. Take a handful of rice and press into a bun shape, making sure to apply an even, firm pressure. Basically, the same thing you would do with onigiri, except you are making a bun shape. Keep rewetting your hands with the salty water as you work or the rice will stick to your hands and become hard to manage. Heat some oil in a pan, just enough to lightly coat the pan. Add the rice buns. Gently turn the buns over after a minute or so. There should be a light crispy coating forming. **If you want to add some flavoring and color, you can brush the cooked side with some soy sauce while the other side is cooking, turn the buns over and brush the freshly cooked side with more soy sauce and finish by toasting that side again as well.
Do NOT broil the buns or try toasting them in the oven. This draws too much moisture out and makes the texture unpleasant. I have yet to try toasting them on my kitchen grill.
Rice buns are so easy and inexpensive to make. We have had them with hamburgers, egg sandwiches, tuna fish salad, peanut butter and jelly, and even cream cheese and jelly. I actually prefer these over baking or buying gluten free bread, if for no other reason than the low cost, neutral flavor, pleasant texture, and how easily I can throw them together. I plan to try flavoring them in other ways, by adding other sauces as glazing or by adding herbs. Maybe add a little food coloring to make them look more like bread buns.
They don't store incredibly well, but I've used older, cooked, unformed glutinous rice with great results. Some people freeze them until ready for use, but I have yet to do that. I usually eat them fast enough that there's no concern. ;-)