1) Whether the behavior should always be the same in each buffer or should
possibly vary by buffer. If the latter, should this be user-changeable (e.g.
local values) or not?
It should be the same in all buffers. There are other ways for specific
modes to control what are links to follow. If the mode sets up no links,
mouse-1 will never follow links.
2) What the default value should be.
The current default is right--we discussed that extensively a few
months ago.
