I feel that you overestimate the acceptable complexity of rules. “Just” introducing a button is already at the limit (and would probably still be rejected and considered too much burden for its gain, and going against the nature of area).
Simple and well known rules are the capture rule, the ko rule, two pass stops and agreement about removals - this is the acceptable level of rule utility per complexity. Any additional rule that is not absolutely necessary will likely be seen as (and imo actually is) bloat, and unlikely to gain support in practice.
Better komi is related to granularity but not the same (for area neither 7 nor 7.5 is as fair and problemfree as 6.5 for territory).
Your other points refer to Japanese rules, while the context were territory<>area - not the same thing. Actual dame play is not required even by J89 (as we discussed here). Superko is concise but a conceptually complex addition, and unusable in an universal ruleset with dual area+territory support. And a long cycle rule under territory is just a convenient shortcut.