heh, i use ESC to close all sorts of windows as well (vendor/talents/quests/professions etc) and jump doesnt work in thoses cases.

I have tried not passing ESC as well, but then as you mentioned you need to jump to cancel spells, but jumping eats a whole couple of seconds before you can recast again (time to land), it's very inefficient.
best way i've found it to hit my formation key for a split second, which makes all my toons move (but they can recast right away). the problem THEN is that it breaks follow lol.

As i was saying, it's not a big deal, but it's one of those little things that annoys me when it happens hehe.

Thanks for the suggestions tho
-Zub