It would be odd to have tanks make dust on non desert maps but have no dust on desert maps. Wolf44, do you have dust on other maps?
The more ideal situation would involve checking additional attributes, such as whether the map is DESERT, and have a wider array of ground dust effects to draw upon.
Perhaps something like a new mission parameter could be introduced, with an established set of effects to select from. For example, a .mis file might have a line entry of DUST=desert, or DUST=winter, or DUST=pacific, etc. Such effects as tank dust and aircraft prop dust/wheel dust, perhaps more, could have a matching variation on the effect. Then the mission maker could pick what he thinks is most appropriate. If a .mis file does not have such an entry, the default effects are used.