[Bf-modeling] option for bevel?

[Howard Trickey]

I would like people's opinion on this task / patch for bevel:

https://developer.blender.org/T45260

It is a problem that I can only figure out to solve by adding an option,
which the patch calls "loop slide", whose effect is this:

If false: the meeting point between beveled edges is placed to, as much as
possible, make the widths of the bevel edges match the user's spec. Any
unbeveled edges attached to those points just move their ends accordingly.

if true: if there is an unbeveled edge between two beveled ones, the
meeting point will slide along that edge. If there is more than one, but
only one that is not in the same plane as the beveled edges (so it affects
the silhouette) then slide along that one.

As the task says, there are some cases where each behavior is desired by
users.

But I hate adding new options, especially ones that are hard to explain
like this one is.  So two questions:

1) should I make this an option?
2) if so, what is the best name for it and the best default value? The
patch has the name as 'loop slide' and the default value false, but I think
I would prefer the default value true, since the cases where people want
loop slide seem to come up more often.  But I am not sure. Another name
could be something like 'preserve widths', with the meaning opposite of the
loop_slide option.
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