i know it may be complicated to make cmds but these are some ideas
.simple and usfull one's:
/lock
/S and /L = /saveloaction + /loadlocation
/mytime
/myweather
/aap = abandonded airfield
/area59
/me
/home = spawn at spawn loacation
and complicated ones:
/createrace
/cp = checpoint
/endrace
then
/loadrace
if u have more idea's plz suggest