Thanks blaacksheep for your reply. Much appreciated.Hi, and welcome to XDA!
Go ahead and use Toolbox now as it's the best we've got to get around the Amazon restrictions on their tablets.
There's only 1 developer - Datastream33. He's made great strides already on the new firmware and there will likely be other advances in Toolbox in the future. If some better options become available, he'll be sure to let everyone know and I'm sure that anything that has to be removed before a better option is employed will be mentioned or even automated. You can run Toolbox more than once to modify your changes at any time.
Plans to update will be made when new options are discovered or are made available, or when a new feature is implemented.