Cheating

[low_bidder]

I look for smoke puffs. AFAIK Smoke is part of the map, not a unit icon. So once the program puts down smoke it stays there unless the program removes it (wind or time, I think). So if an ATGM fires and leaves a smoke signature, reloading the turn doesn't remove the smoke signature. I used to use OP fire as an indicator, but I think the OP fire percentage was changed in version 4.0 Sometime during the 'majic AAA' period. Either that or I have been on a 3 years run of bad luck. Original OP fire required moral checks with modifiers for many different things. Regardless, a hidden unit with no suppression nearly always took the shot. Lately I have had hidden units with one or no suppression and high experience not take the shot.
And yes, sometimes it is pretty easy figuring out where your opponents units are hiding. The maps provide certain hexes with a 'natural' advantage. If your opponent isn't taking advantage of them, he is a rookie and there is no need to reload.
There are run-time debuggers that let you watch a running program from a window. Thousands of dollars. Anyone that buys one to cheat at SP should have spent the money on professional help.

Overall, I'm not sure reload actually helps. The fog of war level is so high in SP that reload to get different results isn't worth the time spent. You might get that unit rallied this load, but some other unit won't. You might make that shot and miss another. If you think things are so critical that one rally or one shot makes the difference then you are going to lose anyway. Might as well accept the inevitable gracefully.