I really love the Grimoire, and I want to use it as no other weapons do what it does in terms of utility (and fantasy fun!).
Unfortunately, I find myself not using it as much as I would like because I find it physically uncomfortable and unpleasant to use for more than a few moments at a time, which is a real bummer.
The Problem:
GIven that the weapons primary fire requires fire-rate in order to shine (fire-rate increases Alt-Fire charge time indirectly because hits give charge) and high fire rate increases visual spam and noise, I have to say that the sound effects for firing the Grimoire are extremely unpleasant at high volumes of fire.
Additionally to this, the flashes from the rapid mini explosions are quite distracting and perhaps even dangerous if someone were susceptible to seizures, for instance.
While I know the visual issue can be remedied somewhat by choosing darker colors, I wanted to point it out none the less.
Finally, the spastic stuttering of the firing animation when played at high speeds is pretty jarring and visually unpleasant.
While I grant that these are potentially just minor issues to most people, I'm sure there are some who feel the way I do and would like to see these issues fixed.
The solution I propose does that and I believe adds to the fantasy of casting spells from a magic book. (Which is awesome, I might add)
The Fix:
Make the firing animation a continuous Channel, rather than a Full-Auto fire of discrete blasts.
Functionally, the math would be identical with damage ticks sped up by fire-rate mods, but the animation and sound effects would be smooth and steady.
As for the animation, what I would love to see is, upon primary fire, an arc of lightning would leap from the book to the casters outstretched hand and then from the hand out to enemies in a crackling beam similar to the Amprex beam.
Alternately, the arc of lightning could wind up the arm holding the book, and back down the outstretched firing arm (like it is going up the one arm and through the body to the other side) rather than leaping off the page of the book. I think either would look extremely cool.
The beam termination upon contact with the enemy could be a small radial explosion just as it is now. The sound effects in this case would just be a steady stream of crackling energy and the blinding flashes would be massively reduced and would not need to increase with fire rate. Indeed, the entire animation would not need to change at all with fire rate. All that would change would be the damage ticks happening behind the scenes.
I am sure there are some people who like the Grimoire as it is now, so perhaps provide an option for the rest of us in the form of a hidden page -"The page of Rov", perhaps ;) - that can be obtained in order to toggle on the alternate, auditory/visual sensitivity-friendly fire mode.