yes please

The current mechanics can be applied to the first unidentified use, but targeting seems like a better option if you already know what you are doing. Learning the upgrade order (as well as figuring out it exists in the first place) is just a matter of rather annoying trial & order, while manipulating it is a matter of extra key presses. I doubt these scrolls can actually help you in a turn-restricted situation.

My thoughts exactly. Unidentified use should just let the scroll do its thing, but once you know it for what it is, you should be able to choose. Right now, that's one of those things that are very user-unfriendly for no particular reason.

Though I also doubt that particular problem would come up very often (these are better used as general preparation for combat, at leisure; in a tight spot there's almost always something better to do with your turns than add 1-2 extra points of PV), except in certain very specific cases, e.g. being at very low HP, not having enough piety for a prayer, having equipment with very low PV and suddenly being surrounded by a swarm of rats summoned by a wererat. :)

Unidentified ones could also be targetable, but should ask "what item you want to target with this" and not give any prompt on what it will do, similarly to Identify scrolls (which should be changed to not tell you that it will identify, just ask what to target.). Add item destruction to the pile, so reading random scrolls and targeting your SLBs with them is actually risky. This would allow the following scrolls to target:

Scroll of Repair
Scroll of Charging
Scroll of Increase Melee Damage
Scroll of Increase Melee Accuracy
Scroll of Defense
Scroll of Protection
Scroll of Identify
Scroll of Great Identify
Scroll of Item Destruction

Which should be enough to create reasonable doubt when reading unidentified scrolls.