Yes, I was successful rendering point sprites. That glEnable-thing is not required. However, point sprites can only have a size of 1 pixel, which makes them useless.

For WGT I'm using a static VBO which is created as follows:
Code :
WebGLFloatArray wglVertices = WebGLFloatArray.create(pointCapacity * 3 * 4);
for (int idx=0; idx<pointCapacity; ++idx) {
	int i = idx*12;
	wglVertices.set(i+ 0, -1.0); wglVertices.set(i+ 1,  1.0); wglVertices.set(i+ 2, idx);
	wglVertices.set(i+ 3, -1.0); wglVertices.set(i+ 4, -1.0); wglVertices.set(i+ 5, idx);
	wglVertices.set(i+ 6,  1.0); wglVertices.set(i+ 7,  1.0); wglVertices.set(i+ 8, idx);
	wglVertices.set(i+ 9,  1.0); wglVertices.set(i+10, -1.0); wglVertices.set(i+11, idx);
}

These vertices are transformed in the vertexshader according to an uniform array containing the actual positions:
Code :
uniform mat4 uModelViewProjection;
uniform vec2 uRadius;
uniform vec3 uCoords[100];
 
attribute vec3 aPosition;
varying vec2 vTexCoord;
void main() {
	int index = int(aPosition.z);
	gl_Position = uModelViewProjection * vec4(uCoords[index], 1.0);
	gl_Position /= gl_Position.w;
	gl_Position.xy += uRadius * aPosition.xy;
	vTexCoord = aPosition.xy * 0.5 + 0.5;
}

This does work fine, the only problem is that the number of uniforms is limited. However, MAX_VERTEX_UNIFORM_VECTORS is at least 128, so it should be save to render 100 points at once. The render larger point clouds you could tried to use textures to store the coordinates. But, that's complicated because float textures are not available.