I have hit a brick wall with my current project and I have no choice but to up my clock from the standard 16MHz. So just brain storing here.
1) Adjusting my code, ill have to address any time sensitive code, should not be an issue.
2) I use Lufa, and imagine there is a clock setting, simple enough I'm guessing?
3) Bootloader, not really sure here. I'd imaging the 16 was in the makefile on build, so I'll need to find the source for the dfu that comes with the chip and recompile/flash.
Anything I'm not thinking of here? I'll need at least a 20MHz but if a 32 is something I can come by it may make adjusting time sensitive code easier (doubling it). Not really sure where to find the ATMEL boot source. Would it be easier to make a switch from 16 to 20 clocks from xtail? I could tie that to a DPDT switch and simultaneously drop HWB lo.