Hey guys. Changing the reg key manually worked for me:
[HKEY_LOCAL_MACHINE\Software\Microsoft\Shell\Rai\
EFBROWSER]
"0"="Opera Mobile 10"
"1"="\"
\\Program Files\\Opera Mobile 10\\Opera10-armv4i.exe\""
"3"=dword:00000000
"2"=dword:00000001
It takes a second to launch.