I think the default key bindings for dwm are a unfortunate in some cases. For example, alt-f, a natural choice for *f*loat mode, conflicts with pulling down the File menu in many applications from the keyboard. alt-T similarly conflicts with using the Tools menu in Firefox from the keyboard.
I realize that these bindings can be changed. But that requires some work (and knowledge of C) on the part of the user. I'm talking about the choice of the defaults. Perhaps the keys modified by alt should instead be modified by ctrl-alt by default? And similarly, alt-shift -> ctrl-alt-shift? I am going to test this idea by modifying my setup. I'll let you know how it works out. /Don