Hi everyone ! First, thank you very much Rachnus to have made SH Mod's return !
So, I'm actually learning how the functions works (never used SourcePawn/SourceMod library before but have prog' experience).
Finally, I made a first small plugin which call automatically the "sm_heromenu" command's after player's spawn. With this, it's not necessary required to write the command to choose your new power!
Also, the plugin will write in the chat who joins the server (it's an extra which works for the BOTs too ahah).