Strange behaviour of url escaping options.

soapUI 4.50 on Mac
I need to build an http get request like the following: get host/url?00000%20%20%205555555
The query string is a mix of URL encoded string and plain text.
If I leave the option "Do not URL escape service endpoints" the URL is actually encoded, and it's not what I want.
If I active the option, the URL is decoded before being sent to the web server.

I believe that in the latter case soapUI should leave the query string untouched.

Thanks.