How do Timer messages support customization

[WonderMing13]

version: RocketMQ 5.0
I have a few questions right now，If I want to support timing message storage for any time. maybe a year.

1. timerMaxDelaySec is need to modify，I feel that I need to modify a few parameters，for example Broker's message expiration time
2. slotsTotal The time wheel only supports 7 days, do you want to modify it?
3. timerRollWindowSlots According to my understanding, it is to solve the problem of timing messages for a long time, and push the time forward by the way. I don't know if there is a discrepancy in my understanding?
4. PROPERTY_TIMER_DEL_UNIQKEY At present, the time wheel scans the slot and takes out the corresponding TimerLog to deliver, but there is no entry for setting the TIMER_DEL_UNIQKEY attribute.