This problem is easily solved with the help of our proposed addon.
The essence of the plugin is that it will help you simulate activity in the forum by creating the fake users. These fakes look like real. They read threads, stay "online", displayed in the user list on the main page. Available option "Increase thread view count by fake users"
You can manually adjust how much and in what period of time must go "users" on your resource.
You can specify the minimum and maximum count for adding users, depend from time.
For this options used GMT.
You can specify to 5 time interval:
from 00:00 to 6:00
from 6:00 to 9:00
from 9:00 to 12:00
from 12:00 to 18:00
gtom 18:00 to 00:00
Also there is option "Use thread in last X days". You can setup this option and fake users will view only new threads.