Hello @Black Unifier 

1. Yes, the ability to earn commissions based on the type of membership purchased (monthly, annual, etc.) is included in the default version. Please see the screenshot for reference.
2. The option to decrease commissions over time is not included in the default version, but we can add it as a customization if needed.
3. You can set different commission rates based on the type of membership (e.g., monthly, annual, etc.).
4. Could you clarify what you mean by "additional commission"? By default, you can reward a user for every new referral they bring in. There is also the option to set different commission rates based on the user's position in the matrix (the level they are assigned to).