Wouldn’t it be useful to have access to the most common types of system icons? This is a mockup & prototyping tool after all.
This would make collaboration and planning significantly easier. I went looking for chevrons, arrows, login/logout, trash, file, etc. and couldn’t find a single system icon. I did find funny food icons and a dozen handshake icons. Fun but not very useful when you’re trying to get clear ideas on paper with many people involved.