This topic is something already listed for consideration, many suggestions and ideas have already been reviewed and SC is well aware on the public desire for new single player maps. Perhaps you could come with a more detailed suggestion on new maps, or new options. There would be more value in something like that than just refilling the available loot in all existing maps.
The current system works on percentages, the reason they did that is because people won't have to worry about leaving the game to attend to real life stuff and risk losing everything they collected before they went offline. The current setting has to do with the townhall level and max capacity of the storages.
Making it possible to loot 100% also won't work with the penalty system we have in place right now. The current system discourages players to attack lower leveled players because the available loot is smaller, giving the full 100% would make it almost impossible for those players to grown and have a normal gaming experience.
So i can say without any doubt that your suggestion to make the full 100% available will not get accepted as it will break the game for starting players, and everyone with very expensive upgrades will have problems to collect the required amount as they will risk losing everything when they get offline for just a minute.
Please read the stickies before posting, some suggestions have been suggested before and have previously been ruled out by supercell. You're able to find a full list of the currently ruled out suggestions
HERE.
Your suggestion is one that won't be possible to implement, any suggestion regarding to the time requered to upgrade buildings are not going to be accepted. Boosting Builders/Upgrading Builders/Assigning Multiple Builders are all ways to bypass the current waitng time and have all been ruled out by supercell. Besides that, buying a 2x speed boost on a builder would be the same as waiting 50% of the build time and buy the upgrade with gems, so in a way you're already able to do what you're requesting but it's going to take some patience for you to get to that 50% first.
This is kinda the same as your previous request, these researches have a set time and you're already able to shorten this by spending gems on the appropriate time. If you want the reseach to go 2x faster, just buy the completion of the research at 50% of it's total time. If you want it to go 4x faster you can buy the completion at 25% of it's total time. Adding this feature would be no real addition to the game, but just an extra option for those who are lazy and impatient and don't like to wait for the appropriate time to spend their gems.
So to conclude on the ''if you agree'' i'm very sorry but i do not agree, all your suggestions are not new and have been suggested before. They have been turned down with good reason and this you could have known by using the
Search Option and check for previously requested threads on this topic. Also you could have read the stickies, those show all currently ruled out suggestions.