Can Zoho CRM integrate with Zoho Invoice in more ways?

Can Zoho CRM integrate with Zoho Invoice in more ways?

I am currently use both Zoho's CRM n Invoice .. I really wish I can just use 1 since:

1) CRM can incorporate my inventory
2) CRM already that have invoice feature

But currently I m not doing so yet becos:

1) Invoice allows me to customise my Invoice number
2) Invoice gives me much more flexibility in customising the description in the final invoice

Really since Invoice and CRM are both very well developed products .. why not just integrating both? Maybe the integrated version for the paid version of CRM users.