Incase you were curious about suppressing the line breaks output after Movable Type Tags, causing them to behave like PHP tags. According to a response from support there isn’t any way to change this. Though an option may exist in the future.

The heavy reliance on evaluating data with “mt:If” tags (due to the limited capabilities of block tag attributes) only serves to make the occurrence of line breaks even more apparent. The end result is a lot of extra white space in the HTML source, or virtually illegible template code. Chalk up another disappointment to Movable Type.