Well you could roll the die and cheat or you could roll the die, look the DM straight in the eyes and say (without looking at the die result) that you hit the orc.
It is an impassioned plea to the DM to allow you to hit the orc. As a DM, I would much rather my players do the later than the former. One is cheating but what is the other?
Is it fair? Is it cheating? Is there a way to cheat fairly?
The DM sometimes fudges rolls, usually in the favor of the player. Sorry guys but we do this a lot. So what happens when you do it?
Well a few things actually.
If you cheat on your rolls the DM uses the inflated results as a baseline for creating encounters. So while you may be rolling a 28 every time even with your 8 roll on your die at +2 to your skill you really are only hurting yourself and your party because the DM will want to balance out the encounters for your ability.
When this happens the party faces a big problem because they are not equipped to handle such an encounter. So yeah you're there and your dice fudging might save the day but what happens when you aren't there? Total Party Kill? It's possible.
Secondly, the DM will eventually catch you cheating. Sure you use those micro dice but you have your buddies sitting next to you and they see what you roll. Also, many DMs I've gamed with have a good memory for numbers and can do some basic calculations in their head to figure out your chances. If you hit every time and you have a +2 to your weapon then they will catch on. Even if they don't catch on, however, you still endanger your party.
So what if I really want to hit? Well you could roll the die and look the DM in the eye and say "I hit!" and hopefully if it isn't a boss fight and you really just need a success then they will let it happen. After all, the game is about heroes and heroes sometimes need the luck to overcome odds. Just remember that when you cheat you not only cheat yourself but you cheat your friends as well.