Trisquel 6 had non-PAE kernels available for older machines that did not support this but they don't appear to be available in Trisquel 7. Since this is really just a kernel config change, it'd be nice if such kernels were available. I wonder if this was just an oversight since they were in version 6.
Maybe so but it doesn't necessarily need to follow that Trisquel must as well, especially since the only difference is a change to the .config.
I believe Ubuntu got rid of it some time between 12.04 and 14.04. :(