TMPFS out-of-disk-space workaround feature suggestion

Hello,

T2 has the nice TMPFS RAM file system compilation support.
In practice this is a bit difficult feature to be used because certain
packages require soooo much disk space from RAM (firefox, xorg etc).
However, most of the packages are quite small and would fit just fine into TMPFS.  

Is it possible to configure T2 Build-Target script to use TMPFS by default and
if compilation of a pkg fails in "out of disk space" error then T2 would revert
back to default disk usage for that package? Next package would becompiled
into TMPFS again and so on.

This would be handy way to speed up compilation in batch build cases where
machine is left to compile over night. It would not matter to compile few
packages "twice". In ideal cases T2 could keep track of these "too big" packages
in some cache file and not to compile them in TMPFS for the next time at all.

I might be able to create such a feature myself, but few pointers would be nice
(which script to look for and which is THE script building a pkg and where to trap
the error and re-try the compilation).

Or is this functionality already in T2 or is the idea doomed already in the drawing board?

Thx in advance and thx for great compilation environment,
Mike N