Running install.rb for piston'd plugins?

Using piston to handle plugins is great, except that the install.rb
script isn't run when you use 'piston import'.

I've tried using script\runner to complete the installation, but ran
into problems with paths.

Does anyone know a way to do this without having to manually perform a
plugin's install tasks?

Cheers
Nick

Use a patch from http://dev.rubyonrails.org/ticket/10034