Garret,
There has being a lot of water under the bridge of saving. The main cause is browsers trying to reduce their exposure to malware. The TiddlyWiki community has responded very well so much so these apparent problems have inspired great new solutions and options.
I understand your reluctance to go from 2.x to 5.x but I am making this move by gradually replacing what I do in my classic wiki. There comes a time when using back versions can not be sustained with the world changing around you such as the browser standards.
In the mean time I retain my legacy wiki in TiddlyDesktop which somewhat insulates me from browser changes.
Best wishes
Tony