I wish someone still made a fully manual battery charger for a price whithin reason. There still may be chargers made this way, but not the norm. I remember Shumacher used to make a charger that was awesome, you put in your own amps ect and it just charged at that rate, knobs you turn to set amps and volts, no automatic crap. I suppose though that the thought of doing anything manual turned off a lot of buyers, and opened the door for operator error.
I know most people don't have access to this, but being in electronics for years I acquired a DC bench power supply with CV (constant voltage) and CC (constant current) modes......
When I charge a new battery I charge it with this power supply in CC mode which I can just dial in the preset current level with a higher voltage setting and off it goes.
A person can pick up a smaller DC power supply like this for around $70 on Amazon........but as you said, it is a totally manual operation.