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It does nothing different to a PDIP 12F683, its just a different size and is surface-mount instead of through-hole.If you are skilled enough with a soldering iron to solder to the smaller pins directly, they are much easier to fit inside a controller
put them wherever you like and i get mine here
the upper spot that you circled (U5) already has an 8pin IC in that location, the lower one (U4) however has no IC (on any CG1 that I've ever seen) you could cut the traces somewhere between the IC pads and the vias and test the controller's operation, if it screws something up (which I highly doubt since it's a blank set of IC pads, but you never know) just repair the traces and your controller's back to normal. if nothing is screwed up then you have a nice spot to place SOIC PICs for RF mods (which as soon as my next batch of SOIC PICs show up I'm going to test this out myself and see how it goes). You're definitely going to have to trace all the pins for U4 to make sure that they don't connect to anything. If nothing is soldered there currently then I'd say cutting the traces isn't going to affect anything (technically they're already 'cut' since there is nothing that they're connected to), but not cutting the traces and installing a PIC could make things go haywire, depending on what U4 connects to...
If you're in a rush to use that location go ahead and test it out and let us know how it goes, if you can wait I should be getting my next batch of SOIC PICs by next weekend and I'll try it out then...