RubyMine setup THIN server with --prefix tag

Hello,

I just started with RubyMine and like the idea to start the thin server directly out of the IDE.
But I need to use a specific adapter setting --prefix=/special.

In the terminal I simple type "thin -p 3000 -e development --prefix=/ror start".
But in RubyMine the system always and only use rails server <server> to start any web server.
This method can'T handle --prefix and I get a invalid option error in server.rb line 33.

So my question is:
How to use "thin start" directly or how to manage to make it work at all?

Meanwhile I can only run thin from any console outside of the IDE.