First of all, every one of the ranged units come in an open formation, however since you can change that to something more compact I would like to know if doing so affects their combat in any way. Their info almost always says something along the lines of "fight in an open formation" so I'm not sure as whether or not they would be pentalized for fighting in any other formation. I'm primarily concerned about possible damage penalties.
Also, I'm sure this question has been asked before but when a trireme is carrying a unit and gets in combat with another trireme, does the type of unit it is carrying make a difference to the damage boost? For instance, would a trireme with a hoplite always beat one with a spearman, providing they were alone? If so, does the unit's morale have any play, or is just their type(i.e., a native hoplite with a general vs. a regular mercenary hoplite - is there any difference in navel combat)?
Finally, does the type of unit affect the trireme's speed penalty - for instance, would a trireme carrying a peltist have a higher max speed then one with a hoplite? I've never seen any deviation, but I havn't looked intensively and thus could be missing a small change.