map control improvements

[zwhitman]

marking as suggestion

Suggest enabling zoom controls on scroll and ctrl+left click to draw zooming bounding boxes. Will make navigating around quicker. Otherwise suggest increasing size of plus minus.

[davelandry]

Great suggestions. We disabled scroll zoom because it awkwardly conflicts with scrolling through profile pages, but we should enable it on the full-screen page. Zooming by bounding box is a little trickier (more work), but still a good idea.

• enable scroll zoom on full-screen page
• increase effect of plus/minus buttons
• zoom by drawing bounding area

[davelandry]

Just put in bounding box zooming while holding shift (more consistent cross-OS than ctrl). I think this alleviates the need to increase the effect of plus/minus buttons.