I believe this had been brought up many times before… but yes, I agree 100%. i-Vault needs portability, so if you go to a library, school etc. where you can’t install any software (or don’t want to), you can use it directly from your usb.
I believe the Comodo team’s resources are all beeing spend on firewall and the antivirus right now, so I wouldn’t expect this feature anytime soon. :-\