Would be great to remove "Sacrifice" and "Ritual" upgrade abilities from "Upgrade Them All" button. This abilities damaging your Eiralon and using the "Upgrade Them All" button inconvenient when you run without healer.

Also sometimes helps do not use abilitie on Bubba "Synchronized Swimming" for getting little "gold found" bonus, but not so critical as abilities on Eiralon.

Maybe option for turn off choosed abilities?

You would potentially need to list all available abilities and extend this for every crusader you have unlocked to make every player happy. Then, the game would need to check your choices and incorporate this in its calculation everytime you hit the button. Something which already takes a second or two and will likely triple or quadruple that time.

From my perspective, this is hardly feasible from a UI-point of view and will result in the game running considerably slower than right now.

One more variant. Abilities work till Eiralon down to 1% of total hit points, but not killing owner, just loose they power. This is more correct for crusader.

@Animenut
Thank, but i written this suggestion because tired of this process. And if you made mistake with Eiralon and purchased abilities, he starts die in 2 seconds without good healer. Situation with Bubba not so critical.

As Bazilus and Amanda both suggest: The ability to turn off any learnt ability (via shift-click or ctrl-click) would be a tremendous QoL-boost. The "Upgrade Them All"-button talent shouldn't require such micromanaging to make sure you don't ruin your strategies.

Speaking specifically of Eiralon, he is a strong buffer, even if only Sacrifice is learnt (skipping Ritual). Ritual is very positioning-reliant (both for himself, your healers and your DPSer), so the ability to turn off abilities would be extremely useful for him.

But this extends to quite a lot of abilities:
* Aggro and deaggro abilities (like Thalia's Lightning Rod)
* Eiralon's powers, as already mentioned
* Bubba's power vs goldgain, as already mentioned
* Pete's Bad Joke with chicken legendary (and no shoe legendary), with only the chicken legendary, learning his main ability is detrimental to your DPS
* Passive abilities with cooldown, like "Shot"-abilites (Arachnobuddy's Web Blast etc), it can be useful to hold them off briefly, for more strategic / optimal multi-use, to make sure they hit more enemies in each blast for example.

There's probably more, but there's more than enough reason to implement this.