I agree. I lose image ratio on chapters covers. (There are 2 or 3 pictures that are really bad. I'll try to solve this later. they are just covers, not major for me

)
I made this because I did not found it on the web.
I also informed people on how to get a better quality if they want (simply change the value in the bat).
I also agree that we represent 2 opposed points of view :
-Prefer quantity over quality because I read a lot but by short time period. I can't watch over the quality (I am lazy to zoom maybe too, because I can read everything).
I can't access a computer during a week usually so I want to add a lot
I do not pretend to provide THE solution to read mangas. Just the one I use and that was lacking easy processing on the web. It will surely improve in the future.
-You are well more on quality, precision, optimisation but it imply to have access to a computer often if you are a big reader.
I like the fact that the two schools are represented here

It gives more choice !
My technique as a big flaw : It is on windows only.
(because DomDomSoft is only on windows, I did not found such a powerful downloader on linux and also because I don't know much of image resizing/extension deleting in command-line on linux).
I will take screenshots with the two methods and make a chart to compare the two

(We can do it on PM before posting it of course).