Just thinking about additional affects of WS:

warrior - reduces enemy acc/eva/atk depending on tp
MNK - tp drain and virus (eg: -25% tp and -3tp/tic) on mob
white mage - adds a buff that inc duration of heals recieved to party members, duration varries with tp
black mage - adds macc/mab depending on tp
red mage - adds a buff to make everyone in the groups next spell be insta cast
thief -
paladin - lowers everyone elses emnity by 12/25/50% depending on tp.
dark knight - dmg increases (greatly) as current hp% goes down
beast - adds spell haste to the pet (duration varies with tp)
bard
ranger
sam
nin
drg - adds a large stoneskin/phalnax to the pet along with a moderate pet heal, ammount varries with tp
summ - adds MAB/ATK bonus to pet and a small heal (10/25/50% heal) depending on tp
blu
cor
pup - adds haste/fast cast and heals pets hp/mp depending on tp (see bst)
dnc
sch - adds a ~regen 4 to all party members, duration varries with tp