Sorry Jerome, it does not work,i tried all the ways but you'll never be able to make a Spearman use its secondary weapon,even givin' them a "solid" weapon in the Cas file and giving the right Skeletons "fs_spearman fs-swordsman" or any combination you like,I've been able instead to make a unit be Javelineer/ spearman , using the Scutarius Cas , exchangin' the sword with a spear,and givin' it the Javelin- spearman skeletons,it works quite perfectly,once they have depleted the javelins they switch to spear and fight with that,also they walk with spears in hand;
so it seems an issue that You CA should address,it must have to do with animation or whatever in the code,but you cannot have a spearman/swordsman workin' ,unless you give 'em Phalanx formation,wich is not the case unless you wanna go Greek style;
I would like if you could investigate about this thing deeply,it would add a lot
for us....

Red:
Too bad weapons can't be added more independently to the models (shields too.) The skeletons already dictate how the weapon is oriented and employed (granted shields are a lot more complicated.) The modularization CA used is good and works well for much of this, but it would be much more flexible from a new unit build standpoint if the weapons could be more independent...relying on the skeletons, and stat_pri for their employment, rather than the CAS. That could allow a given unit to employ virtually any weapon: falcata, falx, axe, gladius, long sword, short spear (short_pike), Iphicratid spear (spear), sarissa (long_pike), bows, javelins, pila, mace, etc.
Well this is not entirely true,you can actually change the weapons as you wish,providing you have the ability to edit the Cas file with 3 D Studio Max or G Max,same for the shields,I do this almost for all my units, since I did not like many of them,but using waht is already provided with the default Cas, you have a ready "library" of hardware to use at your own will...
the only weapon wich has a bacward orientation,is the missile one ( javelins etc..etc..) if you respect this, can do whatever you like with them,shields are even easier to change,most of the times you only need to edit tha Alfa channel for it,whe that's not possible,you can use an existing one from another unit ,or build it up yourself,then it must be mapped ( textured) otherwise it will not show correctly,as it happens when you changed secondary and not seen it..it was because it had no Mappin' in the right spot of the Tga file.
I'll try to explain better:
the Scutarius has a primary weapon,a Javelin, and a secondary weapon, a sword,open the Cas, detach and delete the sword,then build from scratch or import a Spear,attach to the model, link it to the Bone it's going to be used from ( the right arm bone in this case) otherwise it won't move,export it;
then change the unit's stats in the proper Txt file for giving it the right skeletons and all,try it in the game and....it will walk with nothin' into his hands (they walk with the secondary weapon in hand) then when committed,they'll launch the Javelins OK..and then they'll try to switch to secondary ( the Spear we added) and again the'll have nothin' in hand....
that's because the spear IS into the Cas file OK,but...it has no texture,so you have to open the Cas again,select the spear, "unwrap UV" and then mapping it to the right place on the TGA file where the Spear texture lies...
that's it.....
So unless you can use 3 D Studio properly,it's a pain to do this things....

cheers