I don't use the browser very often but I think I can help with some your questions. I checked out the viewing experience of the page you mentioned and you are right, it is nicely spoken suboptimal.
1) I don't know.
2) That is easy. You nee to make a bash-script pointing th browser to the startpage you like and rename it to app. It is to be place in the folder /applications in your pocketbook internal memory drive.
f.i.:
There are other undocumented commandline features which I'm not aware of. You can play with them and see how it turns out. The best way to learn more about your device is to make an backup of the internal (hidden) memory with pbterm and look at the scripts and what are they doing.
3) This question is related to the webbroser? I don't think so.
4) That would be possible but somebody would have to create one first. Have a look at the developer section to see how this is done. I know of a Russian version of the browser which has some more features (not the one you are asking for though) which is not running on FW5.
Btw. you are mixing firmware and app. Koreader is an app (program) which is able to view html files too (as fbreader and adobeviewer which are already integrated in the firmware or CoolReader which can be installed). I don't know if those are capable of viewing those pages better but you can try it out with an adapted script.
PS: In case you are wondering how to change the startpage of the browser link on the homescreen. That is only possible by editing the pocketbook theme. But in the FW5 all the existing theme editors have stopped working, so bad.