You can't apply metamagic to ritual spells, mostly to prevent the complex schema of interactions that would involve.  However, casting mighty wallop on Kasumi ritually is perfectly fine, as would be Garrett's spell.  You cannot take 10 on ritual spellcasting though, even if you have skill mastery in the spellcraft skill.<br/><br/>Also, do remember to be very afraid in the event your ritual botches.  :-)<br/><br/>(although this is MUCH more dangerous in the case of permanent rituals, since you'll often need Break Enchantment or Remove curse to get rid of the bad effects.)