You can install from either recovery. As said, you will end up with CWM because it's included in the kernel. But I believe there is an option in TWRP to inject it at the end of the flash, so you maintain it if you prefer it.
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I'm late but don't think that works on the s2 as it's kernel/boot.img is basically a hybrid of a boot.img and zImage while somehow not really being either. PITA haha
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STANDARD DISCLAIMER:
• Your warranty is now void.
• I am not responsible for bricked devices, dead SD cards, starts world war III, or your cat becomes a zombie
• Please do some reading/research if you have any concerns about features included in this ROM before flashing it! YOU are choosing to make these modifications and we won’t be held responsible.
• Don’t forget to do a NANDROID Backup
ALREADY INSTALLED ON CM 11? (USEFUL AFTER RELEASE 2)• From Stock or any other Rom
• (Recovery) CWM 6.0.4.4+ is highly recommended, I have not tried TWRP recovery and don’t intend to so this is at your own risk if you have TWRP recovery.
• (Download) Download ROM
• (Download) Download compatible Gapps
• (Pre-Installation) Place downloaded zip files on external sdcard
• (Pre-Installation) Boot into CWM Recovery
• (Pre-Installation) WIPE DATA/FACTORY RESET
• (Pre-Installation) Wipe Cache/Dalvic Cache
• (Installation) Flash Rom
• (Installation) Flash Gapps
• (Installation) Flash the i777 UCMD8 modem (I will see how this can be integrated on a later release)
• (Post-Installation) reboot
FEEDBACK:• Download the zip
• WIPE Cache
• WIPE Dalvik Cache
• Flash the zip
• (Optional) Flash updated Gapps
• (Optional) Fix Permissions
• Reboot
Well it seemed like the CM team abandoned out i777, just found out about your OMNI Rom, looks great man, thanks for that.