TFT Editor Questions

Me and my friend have started working on our own map. Will be similar to Defense of The Ancients. However, I we have run into a few problems.

I have heard that the Frozen Throne has a much improved editor. I was wondering if anyone could list the improvements/additions of the editor? I have heard it has some sort of spell/ability editor built in, and this would be excellent if it was true. Mostly I will be just editing spells that are already in the game or creating new spells based off of previous spells.
If TFT does not have any spell/ability editor already in it, what would you suggest as the base editor already out there?

One of the problems we have already encountered is that when you make a unit a merchant that can sell items, the unit has some ground texture under him. I have heard you need some kind of trigger to get rid of this to make him look/act like a regular unit (i.e. being able to rotate him) If you know the trigger or what I need to do it would help a lot. Another question; is it possible to load classic maps in the TFT editor? It would help us a lot as we have already done quite a lot of work with the classic editor, but could definately use the new editor if it has spell editing.

Thank You!

the tft editor is much improved, it does come with an ability editor, and a better trigger system, and more customizable objects in general, along with a buttload of new units, the editor is defintely worth it.
i have no experience with any third party editors, so i can't talk about any of them from experience.
and i am pretty damn sure that u can take Classic maps and put them in the tft editor, i have done it with some of my maps and have not found any problems yet.
bottom line: yes, get tft, even if u only get it for the editor