<< Increasing transmission output is illegal. >>
Sorry Jack but that is incorrect. Power output for any FH or DS Spread spectrum device is limited to 1 Watt within GSM. SOHO AP's/Routers are less than 1/10 of that. I haven't amped LAN wireless devices, AP's, but do it just about every day over 802.11b and proprietary wirleless WAN connections. Perfectly legal. Now widening the carrier might be illegal. The Linksys power hack may broaden the carrier channel into licensed bands. Perhaps amping an AP would have a simlilar affect. When we amp, we do so to recover loss from transmission cable and distance runs, so you may be right, just in an indirect way. Amping an 802.11b device is not illegal in and of itself, but the end result may be.
Edit: As a sidenote, I wouldnt recommend amping a SOHO AP/Router combo beyond just the cost anyway. It's just not necessary. Higher gain aftermarket antennas will extend range significantly.
<< most capable people shy away from playing around with transmission output >>
Lol. Not at all. Beyond the Amtel Controller hack for home consumers, the opposite is true. It's the capable people, hopefully anyway, that are amping their RF hardware to reach longer runs to the clients or remote site, depending on the setup. Wireless ISP's are a good example.