Can't help you if you want ISboxer, but for 5 accounts you don't need it. HKN has everything you need. That tutorial you watched was really basic, you have more instructions like how to resize windows on hkn website:
http://www.hotkeynet.com/p/doc.html
And about Jamba and quests you need to reach like level 10 with all your chars before it starts working due to server restrictions. Also not all quests are shareable so you could just use assist + interract with target and use "accept all" macro:
/script AcceptGroup();
/script AcceptQuest();
/script AcceptTrade();
/script RetrieveCorpse();
/script RepopMe();
/click StaticPopup1Button1
Or you can broadcast mouse clicks same as hotkeys and click accept or complete quest for all windows. Useful for healing addons as well.