Is there any way to zoom in on the workspace past 100%?
Don't think so.
Any ideas?
Got a couple -- maybe even use both:
1. Select your button and edit the X Position and Y Position manually (this is in the Properties window under General Object Properties in 2.0, and under Transformations in 3.0).
2. Use Windows' Magnify -- Start -> Run -> magnify.exe
The Windows Magnifier will do the trick, a bit weird to get used to but I have set my 2nd monitor up as a 200% magnification of the first monitor and it is going to work great.