@ Fraggoso : You can already export the backgrounds, you can't import them back. It won't be ready for the next release but maybe for the one after that (or if someone else does that ; the project is on GitHub !).
But since you can export them already, someone can start reworking them. I didn't see anyone doing that yet.
Also, Aelrobis seems to be making some work about it currently (Export/Import). I don't know whether he'll be able to change the resolution or how his solution will be conflicting with HW though.
@ gledson999 : That's likely not possible to do that directly on the .ppf as the text are not stored very consistently in those files. You can try a search using an hexadecimal editor but you are not guaranteed to find the text and you can't change it to a text with another size.
Here is a solution that should always work :
1) Make a .hwf scan on a non-modded game (or surely you have one already),
2) Apply your .ppf to a game,
3) Rename your .hwf scan with the same name as your modded game,
4) Open HW and your modded game with it ; there should be no scan (since you provided it) and it should display the modded datas,
5) Fix your text stuff,
6-Optionnal) You can take the opportunity to go to the "Mod Manager" tool, check all the boxes corresponding to modded aspect of the game, and then use "Save Mod" to have a .hws version of the mod.
7) Save as a .ppf, then close HW, then apply the .ppf to the modded file,
8) Now that you have the modded game with all the right modifications, you can use
makeppf.exe to create a .ppf file.