Interessting.
When I read the title first I was like: "What?"
Well, checking out the code, it seems to be tmux functions. Well, some of them are quite intriguing! I never bothered to figure out how to spawn a new pane in the same dir. Consider that fuction stolen ;)
I would have advertised it diffetently though. Something like "DWM inspired tmux config".
As other have mentioned, I don't sse why I should use "dwm.tmux" over just the tmux defaults, or my own home grown (stolen) config.
Non the less, quite interesting code!