>Is there any easy way to hack the oscillator circuit (tack-soldering on com-
>ponents as needed) so that an LP-programmed PIC will operate at 4MHz?

I believe the output drive power is decreased in LP mode.
If that is the case, add a simple buffer like a transistor operating as
emitter follower, in conjunction with a resistor.

/Morgan
        Morgan Olsson                   ph  +46(0)414 70741
        MORGANS REGLERTEKNIK            fax +46(0)414 70331
        H€LLEKS           (in A-Z letters: "HALLEKAS")
        SE-277 35 KIVIK, SWEDEN               mrt@iname.com
___________________________________________________________