If we classify our savings and mmda accounts as transaction accounts under Reg D and allow unlimmited debit card transactions, does this flow over to any other regulation and classify these types of accounts as transaction accounts?

I read through Reg CC and it specifically excludes savings deposits so I don't think we need to worry about it (and our funds availability disclosure accurately excludes savings accounts).

Any other reg. that I need to research that limits by "transaction" account?

If you classify them as transaction accounts and they don't meet the definition of savings accounts under Regulation D, they become transaction accounts, either DDAs or NOWs. And that makes them subject to Regulation CC, regardless of whether you label them savings accounts for your customer. I see customer confusion in the making.

Your call report preparation is also affected.

And your reserve requirements.