Zoho Books & Zoho CRM integration - Barely useful?

Zoho Books & Zoho CRM integration - Barely useful?

we are looking to switch to zoho crm & zoho books but the integration seems really awkward and barely useful.

I can only sync Contacts OR Accounts OR Accounts and their contacts?  I have some contacts without an account and some that need to be associated with an account and I'm not sure why we can't have both sync?

Also I think we should be able to sync other modules - at least the deals if nothing else.  I should be able to associate expenses and invoices with a specific deal.  (EDIT TO ADD: Ok it does associate with "Deals" except in books it calls them "Potentials")