It's even more simple than that, there's no such thing in early heraldry. Quartering like the claws, tongues, and the birth of a more complex structure only really appears in the XIVth century. One could say, when considering the timeframe, that there's a first era of early heraldry until 1300 or so, and a late medieval heraldry after that (first crests, quartering, multiplication of claws, tongues, crowns, double heads, chiefs, small charges). That's summing things quite a bit but the usual "coat of arms" doesn't exist before 1300 (emblem, arms, shield are all fine). Before that, most emblems are pure, simple and very repetitive (identification, as opposed to the usual saying, is absolutely not the intent), while their meaning and even symbolism have much more weight.
Other than that you'll be able to make interesting things with the ruler designer or the builder but there are limitations everywhere. The ruler designer for example only allows to use the texture files included in the random generator (if you exclude it you can't pick it in the designer). Plus it gets awfully slow to go browse with so many choices. I plan on drawing a full set of 240 random emblems that you can mix with the charges (from the "emblems" file).
About that emblems file which is in fact a collection of charges (it's complicated, they are also emblems on their own, since even colours are, but pratically they fill a precise role in that case, which is a charge inside the shield) doesn't work with their partition system (because it scales with the partition it makes things looks absolutely horrible and miscentered most of the time). I actually used it to display real charges of all kind instead of the original set. I suspect it's limited in size so I keep it for common things, but there will probably be some lions and eagles of common colours for example too.
One thing about parted shields that would have been interesting to represent though is feminine heraldry. I actually tried to make it happen but there's simply no way to make the spouse's emblem appear in the character sheet. Making a half frame is actually very simple (just cut the frame and the mask for a left and right template, display one side, the other, you're done, no magic trick) so it may be a nice idea to submit to PI devs. Well I guess we can live without it.
It's a pharaonic task as it is anyway (4500 entries in the dynasties text file, 1500 in the flag directory) so I'm not really focusing on things that won't have much use outside the original intent (realistic early heraldry). Plus I have a few other projects about graphics so I need to finish this one day or the other.
I'll get to screenshots. I know I promised.
