Hi Alim,
1. i don't think it is possible to add that directly in Cloud. I think you have to use SDK for this.
2. This is not possible i guess. We have asked SAP how we could hide some "buttons" in the past but they said we could not do it. Similarly with personalization. May be you can remove all the existing stuff from Home and just include your custom reports and tiles.
may be others here can help better.