I'm on Mac OS X and right clicking to decrease speed (SPD) and LOOP does not work and hasn't worked for some versions now.

This works for me on OSX 10.11; pico-8 0.1.5 correctly interprets trackpad right-click gestures in the audio editor (i.e. double-tapping or tapping a corner of the trackpad, depending on how you've configured it in System Preferences.)

However, the Ctrl-click shortcut (which acts the same as right-clicking in most OSX apps) is not interpreted as a right-click by pico-8.

I haven't tested with an actual mouse, mind.

Ah! You're right.... I'm so used to control clicking I hadn't even configured my right button properly. So, implementing ctrl+clicking is this something that we could see in the future or should I simply delete this post?

I second this, especially since shift-clicking has a special meaning in those fields already (raise/lower by 4 instead of 1.)

However, in the sprite editor right-clicking picks up the color under the cursor while ctrl-clicking does a flood-fill, so there would be a collision there.

[Technically speaking ctrl-click is not a shortcut for right-click in OSX: rather, by default ctrl-click means "show the context menu" and right-click also means "show the context menu". Apps without a context menu (like pico-8) often change the meaning of right-click to something else, but the system doesn't enforce that ctrl-click has the same meaning.]