1) Are you talking about the Star Chart? It honestly just takes some getting used to is all. Once you realize RMB can immediately zoom you out, things become much simpler and quicker. If you're talking about the in-mission mini map, then its mainly a matter of getting used to it really. This applies to any shooter really, especially ones that have a diversity of movement mechanics built into them. Once you get used to tileset rooms, you effectively learn the best method of traversing and the mini map makes alot more sense.
2) "Stealth" missions aren't really stealth missions. They're more