The "About" dialog still shows 0.3.10.1 beta.
What OS? I ran the Windows and 64-bit Linux version and checked the about dialog.
The Mac version is still 0.3.10.1.
iirc, it is possible to specify -march on a per-function basis using some gcc __attribute__. That way, only the function in question would be optimized, and if the user doesn't specify -4way, everything else should be ok.
I updated the first post to be more specific. Only the -4way code is compiled this way.