Hi,
1.There is no configuration exposed to change the landing pages. However, the landing pages change based on the user type. For Admin user type , it is Connections . For others, it should be dashboard page.
2. The parameter for idle timeout can be configured in <webclient>\apache-tomcat\webapps\deui\common\scripts\config.js - idle:20,timeout:5
After changing the above values , webclient needs to be restarted.
Hope it helps!
Ravi Kiran