Storing data during a blender session

On the blenderartists forum, CoDEmanX solved my first problem, by stating that you could misuse (static) class variables for this.
Now, creating a movie loop in which coloring must be applied, can be accomplished using something like

import bpy
from radthcolormesh.colormesh import ColorMesh
bpy.conext.scene.__class__.colorMesh = ColorMesh()
def applyColor(scene) :
    colMaxLimit = 150
    latScaleLimit = 650
    latHide = 350
    latUnhide = 550
    frameNumber = scene.frame_current
    if frameNumber < colMaxLimit:
        maxValue = 0.1*(colMaxLimit - frameNumber) + 3.5
        colorMesh.colormap.max = maxValue
    if latHide <= frameNumber <= latUnhide:
        bpy.data.objects["Lat"].hide_render = True
    else:
        bpy.data.objects["Lat"].hide_render = False
    if frameNumber > latScaleLimit:
        scene.colorMesh.lat.setScale(-0.95*float(frameNumber - latScaleLimit)/199.0 + 199.95/199.0)
    scene.colorMesh.colorMesh('Suzanne')
bpy.app.handlers.frame_change_pre.append(applyColor)

Now the data is created only once.