Are there technics which would allow me to introduce new input-nodes
into an existing set of input-nodes without going through this
input-to-RTF-to-input transformation?
No, XSLT takes a read only view of a source tree.
On the other hand the only difference between a node set and a RTF (in
most implementations, allegedly) is a flag that prevents you doing node
set operations on the RTF, so the "input-to-RTF-to-input transformation"
is most likely not a very costly operation. The fact that there was
a distinction at all is widely seen as a mistake and the distinction is
removed in the xslt 1.1 and xslt 2 drafts.
David
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