[O] subtree level bind? separating overlay from mode line?

[Samuel Wales]

i'd like org-time-clocksum-use-fractional to be nil in some tasks and
t in other tasks.

alternatively, i'd like it too be t in the overlays and nil in the mode line.

there does not appear to be a property setting for the first one.  is
there a subtree-level bind so that i can make it depend on the
subtree?

and there does not appear to be support for the second one.  the
variable controls both outline and mode line.  i wonder if this should
allow two settings, one for each.

thanks.

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