It happened, really, it's time for me to remove the "on hold" prefix and officially release the version 3.00.
It's been a long journey and before everything I want to thanks you all for your help and support all this time, as well as for your patience.
In addition of a support for the future 8.x branch of Ren'py, and the support for the 7.4.x branch and following, this version come with a lot of novelties.
Firstly there's the reworked configuration menu. Behind is better look come a big innovation,
you can now save your configuration as default for all games. And in the future (I still struggle to have a good looking drop list in Ren'Py) you'll also have the possibility to partly change the visual look of the tool.
Secondly there's the extended capabilities of the viewer. It now don't limit to the sole savable variables, and don't even limit to the sole stores. As usual, all this being fully configurable.
Alas, this have a little cost in terms of performances. It's not really something unbearable, but if the game use a really big amount of variables, Ren'Py can take up to one second before opening the viewer. It's alas something I can't change. On my side the viewer need around 0.07 seconds to proceed 5 000 variables, the rest is the time needed by Ren'Py to deal with the information the viewer gave it.
But, the filtering list (especially the "Favorite" and "Changed" ones) permit to limit the amount of information to proceed, and so make everything works faster.
Thirdly, I totally changed the way the information are displayed. This permit to make the viewer be faster (yeah, despite what I just said above), and almost removed the problems due to the "hover to see the previous value" functionality.
Take the time to look at the screenshots in OP, they also act as help for the tool, and don't forget to take a look at the in-game help.
There's still few things to do, like the management of the custom filter that can really be improved. But globally they are more cosmetic improvement than anything else. So, except sudden bug that I would have missed, the next update shouldn't come before summer ; and it will mostly be to implement what is still missing in the configuration menu.
Also note that, since the compatibility with older version of Ren'Py have been reduced with this version, I'll keep the 2.05.01 available for people who want to use the viewer with an effectively old game.
Features of this version 3.0: