I will give this a try, when I have the time to dive into this. Seems to me there still would be a couple of downsides:
1. Not possible to store multiple "preset-curves" in the transformer
2. Would have to go into the environment and remove the transformer in case I need to "switch it off"
In the meantime I have created a couple of scripts with the handy tool posted above. I have named them using the following logic: EXP-X-Y where X and Y are the values for the point that the exponential function is based on. Works really well, and presets in Scripter can be toggled through or switched off on the fly. The tricky part is to find the right point to choose, so that the altered slope works well the the response of the keyboard. Not as easy as the say the velocity editor in Pianoteq (because of visual feedback and more points on the curve to alter) but does the job, once you created some curves that work.