Enterprise: Create Contacts AND associated companies in connected account

We are using Enterprise full suite and are connected to three other accounts. For referral deals, we are now creating sales-contacts in the partner accounts and were quite suprised that you are not able to create the associated companies.

Our CSM told us, there is no documented reason for that, but to us this feature is crucial.
We want to give the whole dataset to out partners, not just one contact with an empty company record attached.

I wonder why nobody else brought that on the table in the past.