I have friends in the area who are renting out bedrooms for $400 per month in an apartment so it seems like just another way to improve the cash flow of the property. 

In addition, I think there is still a lot of opportunity for improving the product.BTW I recently looked at Mileage IQ and other competitors in the Apple store. 

Many properties in Warwick are not ADA accessible, which may or may not be an issue for different uses.

It might help you sell the house since you can indicate that it has been upgraded.I would do what is necessary but not go overboard.If you have galvanized, replacing the water line from the street to the house makes a hug improvement on water pressure as galvanized will rust and restrict the flow of water over time.I believable you just need to have working plumbing with good water pressure for the appraisal.I would be more worried about plumbing issues or old piping showing up on a buyers inspection than it affecting an appraisal.

I have access to the LandVision software for doing research on off-market properties, and I'm looking for some recommendations on how to best filter my search criteria.

The blame for poor situations isn't to be shifted or avoided but accepted and then used to as a catalyst to improve. 

I do not have access to MLS.

So if you make money, but have no "taxable" income then that will allow a lot more loans to be accessed. 

If nothing else you would have improved your negotiation position substantially. 

You should be able to keep the tax status for each type of money or improve it with transfers and a good network of people based on your particular situation and goals.