Here is a tool, i was using a lot when i was developing my never finished game-mode.
I never searched if this kind of tool exists, i had base of this program already made for one other game and it was only matter of changing some addresses to make it work for GTAsa.
It offers in-game camera movement and teleporting.
Both useful functions for dev work and maybe for Admin work in server.
It works on the principle of memory manipulation: Read/write data in game memory (RAM)
It might be inconvenient for WASD users because it uses keys: q,w,e,a,s,d,f,r,g,z,x
Its never tested with Open.mp ! ! !
https://github.com/DWORDLARK/GTA_SA_TACO