Someone double cheak for me please...

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I'm just trying to see if I have this correct...

I have a rooted phone with JF1.5 dp1
Radio 1.22.12.29
SPL 10.95.3000

I want to update to Caynogen Rom..

These are the steps I'm going to take...

Partition SD for a2sd

Update to Caynogen Recovery

Flash radio: 2.22.19.26I (If there is a tutorial on this?)

Flash SPL: 1.33.2005

Then finally wipe and flash Caynogen Rom v3.6.2

Is there anything I'm missing?

Nope that's pretty much it. You do not HAVE to flash the new spl..1.33.2005. Not required. to flash the radio just rename to update.zip and flash normally like you would do with a ROM. From my understanding the only 3 things you MUST do, are upgrade the radio to the latest and wipe and flash. CM works w/o Apps2SD and the recovery image is not a requirement. However your approach works perfectly so go for it Careful with the SPL though.

If I don't HAVE to flash it then why should I bother?

Is there any advantages/disadvantages to doing or not doing it?

You don't need to. It's only needed if you want to get a hero ROM onto your phone later on. It gives you ~30 more mb on your /system. So instead of a total of ~72 mb internal you have about roughly 90+ internal.

But if Im doing A2SD the internal memory shouldn't be a problem?

Yup. So just follow the steps you listed but take out the flashing of the 1.33.2005 SPL