Hi, sorry I wasn'T arround so this answers may come a little bit late...

First of all, I'm glad you got it working and liked it :)
Should the 2-9 actually be 3-9 ?
- jep, sorry this was a typo on my site :(
The macro for following is over the 255 character limit...
jeah it gets quite long, I personal use macaroon for this, but bindpad as you figured out also works :)
Seems i added my toons names in a random order instead of doing it the right way and putting the names in the order the instances are brought up
- Sorry I should have mentioned, that the order in the macros should be the same as the Windows.
..is there a way to keep the target selected untill dead?
- Yes there is, but only with loosing the 'targetless' option.
The simplest solution is to simply not put the '/targetlasttarget' as the last statement in your dps-makro
-Another thing you can do is additional to the above is to implement a 'target-and-hold' functionality, where the 'Slaves' only acquire a new target from the leader if their current one is dead, or you trigger the assist manual (this is handy in PVE-Setups, because with a tank you don't always want your DPS-Toons to make every tagerchange your tank makes.)

The 'target-and-hold'-system can be achived by creating a second 'Assist-Button' (I will use 9 as an Example).
(So add a <ApplyTemplate FTL "9" "9"> to the HKN file and change 3-9 to 3-8 in the broadcast-definition)

And bind the following macro to the new Assist-Button (9):
Code:
/stopmacro [harm,nodead]
/assist [mod:rctrl,mod:rshift,nomod:ralt]ToonA;[mod:rctrl,mod:ralt,nomod:rshift]ToonB;[mod:ralt,mod:rshift,nomod:rctrl]ToonC;[mod:rctrl,mod:ralt,mod:rshift]ToonD;[mod:rctrl,nomod:ralt,nomod:rshift]ToonE
and then use a /click-Command to this new Assist-Button to your dps-macros (/click ActionButton9) instead of the old assist.