Well,the Generals/Renegade bones are different then the GmaX bones.
I think that adding different bones to a Renegade model will corrupt it`s functunality...However there is something i saw on the Renegade Mod Community,posted by Greg Hjelstrom about bones in vehicels and Visceroid/Mech bones (the Visceriods were unmovable models and the mobing animation was added seperately and the mech is done in the same way)

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Now Generals "bones" are different (from my experiments with the W3D->GmaX converter) and they function a bit different...to be honest-while observing a model (the AISeal.w3d,that i used to make the Horror above) I didnt see any models so i think that the animations/movements are contained in seperate files that simply show the soldier moving,fireing,etc.
On the other side Renegade Models are *based* on seperate w3d files that contain all bone data (cant be edited even with the w3d->Gmax Converter).In Renegade`s case those were: s_a_human.w3d-Male Animations s_b_human.w3d-Female animations s_c_human.w3d-Mutant Animations and s_z_human.w3d-Kane (green) Hologram aka Big Kane Animation.
I hope this was usefull
