Clicker problem with second character attack
So i'm brand new to this site and duel boxing. I am a die hard clicker (curse me all you want). I'm having a lot of trouble trying to figure out how to setup ISboxer to work with my clicking. I am attempting to duelbox a pally and a mage in WoW. The pally being in my main window. Everything seems to work fine when I select a target with my mouse then click the attack hotkey on my keyboard. The pally attacks with the mage right after him. Its an awesome 1-2 punch. However if I click the same attack with the mouse I get nothing from the mage. I did figure out how to create a repeater region overlay and I see on the second window where the mouse pops up when it's in the area I placed the overlay. However again, I select a target, click the attack on my action bar with the mouse and get nothing from the mage. I have got it to work by making a /assist playername macro but really don't want to have to click a extra button before every time I want to attack something. Is there a way to make it so the mouse works like it does when using the keyboard to attack? Where I can just log in, invite with Shift+Alt+I, then click alt+f and have at it with the mouse.
Sorry if there is already a thread about this and I didn't fine it. I researched quite a bit before I had no choice but to ask for help.