I've been using a translated version of the trial, and I can fill in a few blanks regarding traits.
Left to right, the tabs are 'Tolerance', 'Parameters', 'Attack', 'Skills', 'Equipment', and 'Other'. The Tolerance tab is pretty much as you said, so I'll just briefly cover the others.
Bear in mind that these aren't my translations, but taken from the translation that I've been using. I can't guarantee how accurate these are, as I haven't tested any yet, but hopefully in the next few days I should have some time to take a look.
Parameters: This tab has three options - 'Normal', 'Additional', and 'Special' ability values.
Normal Values are 'HP', 'MP', 'Attack', 'Defense', 'Magic Attack', 'Magic Defense', 'Agility' and 'Luck'.
Additional Ability Values are 'Hit Rate', 'Evasion Rate', 'Satisfaction Rate' and 'Satisfaction Evasion Rate' (No idea what these are supposed to be), 'Magic Evasion Rate', 'Magic Reflection', 'CounterAttack Rate', and 'HP', 'MP' and 'TP Regeneration Rates'.
Special Ability Values are 'Accuracy Rate', 'Defense Effect Rate', 'Recovery Effect Rate', 'Knowledge In Medicine', 'MP Cost Rate', 'TP Charge Rate', 'Physical Damage Rate', 'Magic Damage Rate', 'Floor Damage Rate', and 'Experience Acquisition Rate'. I'm not too sure about some of the Special Ability Values - 'Knowledge in Medicine' in particular is rather unusual, and hopefully I'll be able to test it soon.
Attack: These are fairly straight forward - we have 'Attribute on Attack', 'State on Attack', 'Attack Speed Correction', and 'Additional Attacks', though I'm not sure what effect 'Attack Speed Correction' has.
Skills: Under the Terms tab of the Database, the bottom-left box is for Skill Types. Only two are set by default in the Trial version, and I believe they translate roughly as Skill and Magic. The Skills Tab has four options again - 'Additional Skill Type' and 'Sealed Skill Type' enable you to add/remove skills categorised under the different Skill Types, and the other two options, 'Additional Skill' and 'Sealed Skill' serve the same function, but with individual skills rather than whole groups.
Equipment: The first two options, 'Weapon Equipment Type' and 'Armor Equipment Type' are to select the categories of weapons and armor a given class/actor can equip. These categories are also defined in the Terms tab; Weapon Types in the Upper Right, and Armor Types in the Lower Right. The third and fourth are 'Fixed' and 'Sealed' Equipment, and the final option is Slot Type, which enables you to choose Dual Wielding. Selecting Dual Wield as a trait for a class also changes the initial equipment for an actor of that class (from shield to weapon 2).
Other: Now, I'm not too sure what a lot of these do, but I'll list them anyway.
First option is 'Number of Additional Actions'.
The second is 'Special Flag', containing 'Automatic Combat', 'Guard', 'Substitute', and 'TP Carried Over'.
The third option is 'Extinguishment Effect', with 'Boss, 'Instant Elimination', and 'Doesn't disappear'.
Finally, the last option is 'Party Ability', which contains 'Encounters Reduced by Half', 'Encounters Disabled', 'Surprise Attacks Disabled', 'Preemptive Strike Rate Up', 'Double Currency Acquisition Rate', and 'Double Item Acquisition Rate'.
Again, I'm not entirely sure what is meant by some of these terms. I'm still relatively new to the RPG Maker series anyway, so there's still a lot for me to learn. So, it might be the translation, or just me, but I'll hopefully get a chance to explore some of the more ambiguous effects in the next few days.