With the introduction of the new (much improved and very fun) taming system, I came to the conclusion that some creatures, for instance troglodytes, should be considered Semi-Sapient. With the care of your animal trainers, they are beaten into valuable haulers, and possibly wall builders. When you have trained a Semi-Sapients, their grandchildren could become fully Sapient, if you kept your fortress that long (well it could happen at World Creation). This would make civilizations more interesting, and could also be the source of new ethics tags, as this would not be slavery per se but a form of colonization.
You could go as far that there would be a new preference in character: Xeno-Integration. So if a dwarven king is Xeno-Phobic, he would pass laws that would forbid integration, thus making non-dwarven citizens illegal, which would create an apartheid situation. On the other hand, a Xenophile would allow them to become full citizens, and with their new personality traits, the ethics could change a bit around, or could lead to !!FUN!!. This would make the new humanoid species more interesting, as it would be nice to eventually have sparrowman troops, in shiny armour, fighting on your side.
Regarding the armor, if an integrated sparrowman would become a smith, and reach an attainable high level, he would eventually become inventive and create an armor template for his race. So it would become possible for the player to create new armor for the new humanoids in the civilization. (This could be the system to gradually make the weapons of other civs available, as well). I mean the taming system shows that the dwarves are actually able to learn new stuff and advance, as they are able to become adept at taming more varieties of animals during gameplay.
So any thoughts?