I vote No to any of the proposed changes.
The core functionality of CAPs is fine as it is. The current 200% max; variable with difficulty along with the maximum stake reward/block functions just fine.
The only complaints against Bottlecaps with any type of regularity are that the wallet uses too much resources. Any development should focus on this type of improvement not on changing the fundamentals.
Also, even though the current split/combine thresholds were set by Tranz at the low value levels for a valid reason no one typically leaves there blocks at these sizes and consequently spend a lot of time in coin control managing their block sizes (ie most people manually make their blocks in the 5000-6000 range). I think for user 'quality of life' having these values be able to be set at whatever a user wants easily would be a nice change. I changed these for myself in the source code and as a result just leave my wallet running 24/7/365 never having to even bother with the hassle/waste of time of managing blocks in coin control...it's great.