Yes, I've tried it and was going to mention it in the instructions... Unfortunately it doesn't work properly. There are at least two issues with it:
1) It is tuned for a particular full-sized glider, ASK21 IIRC, and adapting it to another plane requires changing constants in the code. These constants are very model-specific.
2) Problem #1 might otherwise be solvable, but there is a more serious limitation. The plugin models altitude gain due to a thermal using additional wing lift, i.e., it basically pretends that within a thermal the glider's wing lift becomes higher. In reality these two kinds of lift are very different; a glider gains altitude in a thermal because the surrounding air rises; the forces on the wing stay the same. I believe the reason the plugin lumps these phenomena together is that X-plane's API doesn't provide a way for plugins to directly change the z-coordinate of an aircraft's reference frame (affecting x- and y-coordinates of the reference frame, and hence modelling wind effects, is nonetheless possible).
The upshot is that the right parameters of this "lift-based thermal approximation" for a given aircraft are really tricky to pick (especially so for RC-sized planes), because aircraft generally assume that at a given airspeed the angle of attack/lift doesn't change without changes to the wing camber or aircraft attitude. If approximation parameters are even slightly off, directly increasing vertical force acting on the wing leads to sharp pitch-ups and/or rolls, and makes the plane uncontrollable.