It would be nice to have a setting for the fill levels on the overflow and top-up valves. Currently both use the same setting of 80%, which is a bit inconvenient for me.
For example, with Krastorio2 there are a lot of processes that have a secondary fluid output (for example oxygen from water electrolysis for hydrogen) which mustn't fill up or the process stops. But it's also required input for some other process, so I also need primary producers of that fluid. Furthermore there are other processes generating hydrogen as a secondary fluid output (chlorine electrolysis).
So I'd want to set it up like this:
Secondary producers -> straight into the pipes (so this output is used up first)
Mixed producers -> to 80% fill level using overflow valve (so they are used as much as possible without over-filling since they're generally cheaper)
Primary (backup) producers -> to 60% fill level using top-up valve (fallback if the rest don't produce enough)
Basically I'd only really need a way of changing either the top-up valve or the overflow fill level using a setting.
What would also be nice is a third tier, basically an overflow valve with 95% fill level, acting as excess valve or waste valve, if even the secondary producers exceed the demand and some of it needs to be dumped or burned.
For now I made a private mini-mod to make these changes but it'd be nice to have them as settings in Flow Control itself. It works really well with different fill levels, but I imagine that changing the hardcoded values might break some factories.
[edit: fixed use case for mixed producers]
