Units can not be configured after selecting factions at all. You can't change the lore on spellcaster characters, you can't pick "marked" variant of WoC units.
Selecting / deselecting items and abilities behaves weird. Select all / deselect all simply does nothing. While I select one the other gets deselected automatically.
I think that I can disclose some revolutionary idea here, but what if... the software could be TESTED before the public release? It may look like a brand new brilliant idea that CA could pioneer and definitely not a well-known widely adopted software development practice described like 50 years ago.
Since the new patch has dropped, I am having issues selecting units and abilities/spells in the lobby prior to starting a battle. I will, for example, click the "select all" or "deselect all" box for a set of spells, and only some will actually select or deselect. Same with abilities. For example, I can deselect all items for a Warlock Master...but it keeps the Wand of Jet and I have to manually deselect it. Also, and mor problematic, I sometimes cannot change units, for example if I select a Grey Seer, I cannot change it from a Grey Seer of Plague to a Grey Seer of Ruin.