Insisting on minimum returns ensures adequate compensation for my money and time as fix and flip is not passive by any means.As a finance guy what I prefer even more is IRR.

If he's managing the rentals so you can focus on this, then as a larger partnership you are sharing the management responsibility...so maybe a 70-30 or a 60-40 works...or 50-50 but your time is paid/compensated...there's really no right answer...

As a Non-Realtor (myself), if someone were to present you with off-market, highly promising HOT leads suitable for the MLS, what compensation structure would you consider to be fair, for the individual providing such valuable leads?

A manager of the LLC may or may not be compensated and certainly does not need to be a corporate trustee type, like a bank.

Any advice on how to compensate contractors/tradespeople to ensure that you get good people who do good work? 

Having a vehicle that drips oil on my driveway is good enough reason, having insufficient credit is the easiest saying without compensating factors.

But if you offer less than one full month's rent, it may make it harder to market your unit on the mls, since your property's offered compensation will be less than other competitors on the MLS.On 2), the fee doesn't bind you to use them if you sell the property, only that you'll pay a commission if they bring you a buyer for your property. 

Your recourse would be to ask them for compensation and when they tell you to get lost, you would need to sue them.

I think it helps to compensate fairly given the market.

An appraiser has very little incentive to go back and redo an appraisal once it is complete as they are not compensated more for doing so unless there is a huge mistake of some sort.