feature request: xffm: multi-rename

it is often very useful to be able to rename sets of files with 1 command.

there is a simple CLI utility 'rename' (Gentoo  sys-apps/util-linux ),
with syntax 'rename fromstring tostring filespec',
which will rename eg files 'test1.txt' 'test2.txt' 'test3.txt'
to 'test11.txt' 'test12.txt' 'test13.txt' via 'rename st st1 test*.txt'.

with KDE -- whose pgms i'm willing to use if necessary -- ,
there is Krusader as file-manager, which calls Krename to do this job:
all v efficient, but rather heavyweight, in the best German trad'n (grin).

it wb nice to be able to do this kind of job with Xffm,
but AFAIK at present there is no means of accomplishing it.
can i encourage someone to give it a try ?
if the answer is "Do it yourself!", what do i need to know beyone K&R 'C':
eg how do i start to learn re Gtk ?

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