That may be a little off topic, but the thing I don't like about the tilemap object in C2 is the fact that you can't select and move tiles.
You have to erase them and draw them again.
For one of my project I drew my maps with a drawing software (photoshop, paint…) where each pixel represented a tile.
In my C2 project, I loaded the small png of my map into a sprite, which I pasted into the Canvas plugin. Then I iterated over all the image pixels like this :
if current pixel color is ###### then create this tile at the current coordinates.
It made my level modifications easier than beeing stuck to the tilemap drawing directly into Construct 2.