[RustedBucket]

To make this work with Photopost is a very simple fix. Go into your admincp, go to Plugins & Products, then click Plugin Manager. Find and edit the plugin Insertando Tabs.

There's 2 IF statements that need to be modified. They are both the same so do this twice.

FIND:

if (in_array(THIS_SCRIPT,$scriptactivo))

REPLACE WITH:

if (in_array(THIS_SCRIPT,$scriptactivo) || in_array(PP_SCRIPT,$scriptactivo))

Remember you have to do that twice to replace both IF statements.
Then save the plugin.

Now you can simply configure your tab to use THIS_SCRIPT and set the THIS_SCRIPT value to PP_Pro.

Enjoy