default logs, customization, clearing events, host groups?

This is sort of multiple questions rolled into one.

First off, some of my default logs are not showing up on eventlog analazyer, specifically one of my servers's system logs isn't showing

second, I am wanting to know are log statistics real-time or hourly and will they continue to sum together or will they be cleared? Is it possible to clear them manually?

Third, am I able to create host groups that I can monitor, is there a way to setup the dashboard to show events by host group, then allow me to drill down if necessary?

example:

if I want to group all of my SQL servers together and monitor their logs as a group, drilling down into them if I need to, is this possible?

finally, is there anyway to import customized logs, or setup logs that aren't recognized by the program, and also to determine which logs show up on the important logs tab?

I know it is a lot of questions, but I want to make sure this app can do what I want before I take it to the boss for a purchase