No, you don't need to recompile anything - even when changing the code, actually, since most of it is Lua code which is compiled just-in-time, so it's enough to change the .lua files and you're set. In fact, you could probably update an older binary (compiled) version by just adding in more current Lua files.
For most of the command line switches, they work in earlier versions. I only added the possibility to set the "0" option to disable full refreshes alltogether. You can probably give a very, very large number there and have the same effect.
Those are command line switches for the vnc viewer, so you add them at the point where you call/start the viewer.
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