Well, actually there is a possibilty, you can download a script which has an anti-idle function

>>> i recommend you download the NoName script from
http://www.mircscripts.org or from
http://www.nnscript.de/ >>> the NoName script has a function that you can choose to Enable anti-idle, and choose the max.idle time, for example i would like to set the max.idle time to 20 seconds

. Try it, and tell me if you're are satisfied with the answer or not.
Regards.
#ircsupport @ Undernet