Here is how to change height in SimPe. This works with the older versions of SimPE, I don't know if it works with the new version. I appologize to whoever originally posted this, I have no idea what your name is. But thanks!
PERMANENT STRETCHSKELETON USING SimPE:
-On the Plugins drop-down menu select the Neighborhood Browser and select the desired 'hood, then open the Sim Browser and load the desired Sim.
-Once the Sim's data is displayed on the mid-screen "Plugin View" tab, click the blue-text "Clothing" hot-spot mid-screen.
-Ignore the Clothing Data on the bottom half of the screen. Instead look at the top left column with the "filetypes".
-Click on "Age Data" and look back mid-screen at the "Plugin View" tab.
-In the bottom left frame, scroll way-y-y-y down to the "Stretch" field near the bottom of the list, click it to highlight it, and change the value in the box on the right (Valid choices between 0.0 & 2.0).