I agree Saracen camels should be slightly stronger, especially as they completely random before Zelotry, which is really, really expansive, and as they have Mamelukes, better versus the units camels are supposed to counter (except camels themselves). I would rather make them a bit faster or bulkier (more HP) though, and I would love to see them available in Feudal Age.
On Turks, giving them onagers won’t change anything in trash wars. A new trash unit is always possible (I mean, the Persians, Berbers, Magyar and Malay, and to some degree Vietnamians have theirs!), but I would rather buff their hussars with more pierce armour (to start), and let them have longer lasting gold mines.
On Lithuanians, I would rather have them keeping paladins, but with less armour, and have Leitis become the cheaper (as it is now), less bulky (take 20 or 30 HP away), harder hitting unit.
Portuguese should receive a small early game buff which would not make their late game even stronger.