Well Both Naboo, and Tatooine would work perfictly for that. In the movies when Luke, and Obi-Wan come across the Slaughtered Jawas he states that it Was the Empire who killed them useing banthas and gafi sticks to cover their tracks. So yes Banthas were uesed in combat by the Empire. Also you see DewBacks being used on the planet by the Empire especialy in the first release DVDs where you see them ride them around and interact with them as well.

You also take note that the Storm Troopers are armed with some kind of combat stick. Would be nice to have that too!

Also on Naboo there are planty of sceenes where the Gungans use their Kadus in battle, as well as those massive Fambas! I could easly see the Rebles working with the Gungans to free Naboo from the Empire. Heck it was one of the best maps in SWBF1. I mean it was so cool to ride around the Kadu through blaster fire, and it was a great way to get to a CP fast. Though ours should be able to have two players on them instead of one.

Also in times of war especialy WW2 witch much of StarWars is baised on. Lots of contries relied on animals for pulling of arty and troop transport. Especialy the Germans, and Russians who both used cavlery in combat, so did the Polish, and French as well.

Just because it's a StarWars mod dose not mean we can't have some fun tossed into the mix right? If it is done in real life it should be done in the mod. I mean for heavans sake you see the Empire use all kinds of creatures in the StarWars movies. Whos to say the Rebles did not do the same thing but more so because of their lack of credits and reliance on forming relationships with the local populations of planets.