However, required downpayments were typically 40-50%, and would be difficult without a residency visa.

Canton is not quite as bad, although they have increased annual fees and initial inspection requirements in the past few years that Akron never put in place. 

I know lots of installers don't do it, and I personally prefer the unimpeded look, but anything installed outside of the requirements of the material is probably going to be limited, i.e. the insurance company is not going to pay you because the material was not installed according to flooring requirements. 

That is often a matter of opinion and will depend on the attitude of your municipality.Most municipalities do not require neighborhood approval, but will offer the public opportunities to provide input which will be considered.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

I'll add a few more things that can have a huge financial impact: required reserves, LTC (loan to cost), application or other upfront fees, and prepayment penalties.As a fellow flipper, I think it's important to have reserves, but they shouldn't be required as part of your funding.

Rent control measures, burdensome employment regulations, and excessive administrative requirements exemplify this.

I have some news for you, FHA does NOT require a 1 year work history!

Obviously each deal is unique and requires proper due diligence. 

Real estate is NOT a passive investment and requires lots of analysis and education.