In what circumstance would you not enable DFS channels on a WLAN infrastructure?

After importing a floor plan to a predictive design tool, what should be done prior to adding APs, antennas and attenuators (e.g., walls)?

An amplifier has a 1 dB compression point of 32 dBm and a gain of 20 dB. Which is the highest average input power shown here that would be safe to operate a 24 Mbps 802.11g signal so that spectral regrowth is not a problem?
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A customer wants to deploy a WLAN that employs centralized forwarding. What LAN requirements should you look for?
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What kind of antenna results in a nearly circular pattern on the azimuth chart but a very flat donut shape on the elevation chart?