Long Standing Unarmed Damage Problems

[CptCoots]

So I know this is a problem with a great amount of history but the wMain.xdy_z tags are tricky (at least for me), and authoring custom dice seems to me to be out of my reach (unless you can show me how to in a straightforward manner - doesn't have to be easy just straightforward).

A little background on what I'm doing, I'm almost done implementing the Revised Core Rulebook for Star Wars d20 in the standard d20 setting (I made a copy of the 3.5 game system so I could completely screw with it without worry while I was building). A sticking point is the Martial Arts, Improved Martial Arts, and Advanced Martial Arts feat progression. Specifically, the damage progression.

Long story short MA->IMA->AMA gives Medium characters unarmed strike damage of 1d4->2d4->3d4 (Small get 1d3->2d3->3d3 and Large get 1d6->2d6->3d6). Now if you've messed around with d20 sizes, monk class in Hero Lab, or any other sort of natural attack fiasco then you know
a) those aren't the typical size progressions
b) there are no system tags for 2d3, 3d3, 3d4, and 3d6.

I can circumvent a) but b) is a real pisser. Anyone know how to write my own damage tags?

This is the logic behind my script that is in the Martial Arts Feat:
Post-Levels 5000
~ Get our unarmed strike pick, delete the damage tag from it, and assign
~a new damage tag.
var result as number
var dice as string
result = hero.child[wUnarmed].delete[wMain.?]

~need to find out which feats are on, namely look for HasFeat.fImMA and .fAdMA and what size we are!

if (hero.tagcount[Size.Medium]<>0) then
if (hero.tagcount[HasFeat.fAdMA]<>0) then
~commented because these break.
~perform hero.child[wUnarmed].assign[wMain.3d4_X]
~dice = "3d4"
elseif (hero.tagcount[HasFeat.fImMA]<>0) then
perform hero.child[wUnarmed].assign[wMain.2d4_6]
dice = "2d4"
else
perform hero.child[wUnarmed].assign[wMain.1d4_4]
dice = "1d4"
endif
elseif (hero.tagcount[Size.Small]<>0) then
BLAH BLAH BLAH
endif

field[livename].text = field[name].text & " (" & dice & ")"