If trying command "addnode", I get the answer "Method not found (code -32601)". command "help" does not list a command "addnode".
...
My wallet has no coin control, it's important to me. As I remind, wallet version 0.6.0, that I tried before, had coin control.
That's because Slimcoin 5.0 is (via Peercoin) a clone of Bitcoin 0.6.3 beta - yes it
really is that old - see the Slimcoin
README where it discusses 0.6.3 BETA.
The coincontrol facility and
addnode RPC-API command were added much later to Bitcoin. Fortunately I was able to copy the former from a later version of Peercoin and back-port the latter from Bitcoin. That's why they're in Slimcoin v6 and not in (the original) Slimcoin v0.5
Cheers
Graham