I know at least one way:
to remove continual flame...
open spells.2da
go to 419 - which is continual flame
in the cleric and wiz_sorc colums put ****
save the 2da and add it to your hak
to remove brew potion...
open feat.2da
find brew potion
add an impossible requirement to one of the columns (e.g. change the MINCHA field to 99)
save the 2da and add it to your hak