What people "want" and what is "practical" are two very different things.
People do sense resistors in power supplies as PCB traces so resistors have in fact been done that way. It is a question of making something practical at the OPs frequency.
The Q of a strip line system is limited by the lossiness. It may be enough for the OPs needs.
Current sensing is the one where I know of good results from making resistances on purpose.
There have been a few cases where I wished I could make resistors inside the PCB. The one that comes to mind was the need to block 1.2..GHz with a filter. I didn't do it though. I ended up with a "U" shaped RLC circuit. The resistance of the inductor was enough for my purposes.
the evil TVC-1 chassis used a Cu trace for the filament resistor. what a POS. I shorted them on dozens of TVC-1s used as colour monitors in videogames, to crank up the filament voltage and get a bit more use out of soft tubes. most ran happily for several years afterwards.
I also read a paper a few years back on one-shot "guns" that discharged a bloody great cap into a little bit of PCB trace, and captured the resultant "bang" to fire a projectile :) The really cool part was how they used a 1N4007 as a one-time switch for (IIRC) 4kV
Cheers Terry
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