Is this value displayed clearly in any place of the interface? If it is, please let me know where. I haven't been able to find it.
If not, given the number of spells and abilities in the game that uses melee and ranged touch attacks, one nice improvement will be to show the Touch AC of a creature, just like the normal Armor Class in displayed in the character sheet. The game also nullifies the corresponding bonuses when the creature is flat-footed, which has great utility. But when touch attacks are involved, the only option is to open the character screen of each monster and add/subtract the bonuses by hand. Again, when you are fighting against a dozen enemies or more, keeping track of all values becomes tedious. The percentage is shown correctly by the helper tool when you aim a spell at an enemy, but you need to be in range to activate it, so implies you need to move the spellcaster near the enemies and this is not advisable. Also, the correct value can be seen in the combat log after casting the spell.
Perhaps the Armour Class screen is the easiest place to add it or when you have finished the initial village and eliminate the bugs, use the space occupied by the 'Eyes' in the Character Screen, being the only info on it that is not relevant in any way to tactical decisions and move the appearance ones to another tab.
Thanks for reading.