Here's the background. I'd like the planetary year to be just under 800 days, with a longer number of hours per day-cycle. If the settlers live in the Mediterranean type climate area only and use greenhouses in addition to outdoor farming, could there be enough atmosphere and gravity to make scientific sense? 

The planet was selected to allow human life. There is drinkable water, breathable air and enough gravity to make sense for long-term human occupation -- births and so on. It took over 90000 years to get there, so the settlement planet has to make sense. They were not pressured to land.

I can adjust the length of anything, but would still like my planet to be as different as possible and still make real sense from a hard-science pov.