Hey,
I think MTA must add some more objects, like the walls (http://gta-sa-mp.de/object/?searchName=wall) on the beneath of the page, these things are very usefull in mapping though are not included in MTA, since MTA has the best mapping controls, I'd like to see those objects here.. because map editors which have them have really shitty controls, and slow down the mapping progress..
Feel free to discuss, or add things to this.