Adding supportcenter features & more

Let me explain the kind of work we do. We provide IT help desk/technical support not for internal users, but for other small and medium business. We are in the B2B way.
ServiceDesk Plus does not provide the Accounts and Contacts by Account/Assets by Account/Request by Accounts that are present in supportcenter. This will be great for us and for many IT support service companies. And to assign assets to these accounts so we can take care about them, have an request history for an asset/account, etc.
I tried both ServiceDesk plus wich does not have this kind of features wich is mandatory for me when deciding the purchase, and SupportCenter wich does no have the IT help desk vision.
A mix in a B2B version will be welcome and may decide a purchase.
Also I suggest a little more customization in the main page like add custom links etc.

Thanks

Pablo