First problem, adding IDE tools (i.e. toolbars):
- we need to use a terrain editor in Catalyst IDE and multiple "File/Import..." actions are very expensive (time, money, errors, bore...);
- best solution appears a custom toolbar containing terrain tiles;
- is it possible?
Second problem, adding Flash Catalyst run-time zoom:
- we need to zoom in-out our states at run-time (if possibile, without changing state...) and to move left-right-up-down in zoomed states;
- every solution is a goos solution!
"The more data we have, the more likely we are to drown in it." (Nassim Nicholas Taleb)
To your first problem, no Flash Catalyst is not expandable. Although it is built on Eclipse, it does not support plug-ins.
To the second question, that is something handled via code that can be developed using Flash Builder.