on my air tools the first thing I do is remove that stupid trigger catch. When I use the tools, I put one fat finger under the trigger to control the speed.
I removed some cable guides from a paper-thin aluminum frame yesterday. Using the finger-under-trigger technique I was able to "idle" the grinder at a very low speed for the last part, I used a manual file to the major work. My kit also came with some interesting "wavy" belts that look like they do neat things.
I haven't been this excited about a tool in a long time.