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If you have no record of when the engine mounts were last replaced, change them. The rubber gets hard as it ages and no longer absorbs the rocking motions of the engine. They are cheap - ~$15 or so each, I think - just change them! Do the tranny mount too while you're at it, it's not hard. Do NOT wait for clunking noises!
I've been told the engine shocks are there mostly to limit the shake when you shut down the engine, and that they don't really affect normal idle shaking (that's what the engine mounts are supposed to do). The shocks & shock mounts are expensive - only change them if they are bad (remove them & pull in & out to test - should give resistance.)
Valve adjust is a good idea (should be done every 15 or 30kmi, I think). May not help the idle though. Diesel Purge will only help if injectors aren't clean. If they are worn (nozzle needles) then all the cleaner in the world won't help, you'll need to have a shop rebuild your injectors ($100-250 per set). No, the leaking return lines won't have any effect on idle quality. The rack damper bolt wouldn't hurt to repace with the updated style (yes, it's the thingy you're looking at by the oil filter can), however be warned that getting it adjusted properly can be VERY tricky! And even then it may not cure your problem.
I still think motor mounts are the first thing to do...
Regards,
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