You can do on the road mapping you know, and arguably its better than on the rollers. A lot of the MLR boys map theirs on the road with the opensource software you can get to map Evos. Seen some amazing results, proven by proper dyno measurements.
Personally I wouldnt map it myself though, I dont know what I'm doing.
Thats why I want to do the EFI course since I've seen the ECU software... and I'd be afraid of breaking something. And no don't own a rolling road... on the road mapping would be the way and then prove it at a later stage.