[1] Please support keyboard accelerators (indicated by underlines in control labels) (https://msdn.microsoft.com/en-us/library/windows/desktop/ms646335%28v=vs.85%29.aspx)

[2] Please allow user press first letter in combo box to select item.

Eg: in dialog "Add download":
Step 1: user should press: Alt+G to select combo box "Group:"
Step 2: press "S" to select group "Software"
Step 3: press Enter to start download

Thank you very much!