Playing 5CD microstakes today, getting dealt AAATT in the BTN. I raise and considered ditch a T to draw 1 so I would look like a draw and possibly getting paid postdraw. Is it stupid or good play?

That would be like doubling down on a 21 in blackjack. You got the win. Book it

Don't do it. Playing microstackes they normally call you and draw for the flush in the SB-BB. I created the same topic one year ago and most players told me that was a bad play. And if they made the flush they don't care about you patting or not, they will re-raise you most of the times. Not to mention if they improve two pairs, then you have the nuts.

You can also do some weird plays with that hand. For example:

Hero: Raise
BB: 3-Bet
Hero: Calls
BB: Draw 1
Hero: Draw 1 (T)

BB: Raise
Hero: 3-Bet

Yes, it depends on positions, opps,... but sometimes it's definitely +EV.
BTW one time I broke FH and get quads

Yes, I wasn't aware anyone else did this actually but it's something you should consider using in the rare event you get a Full House of KKKxx or AAAxx. The one downside to being dealt pat hands is that you often kill your own action the moment you stand pat because you're repping such a strong hand.
The example you used is of course perfect because you're on the button, meaning if one of your opponents draws 1 card then you can play it safe and change your mind to standing pat. If they draw 3 cards or 2, then your AAA will end up the best hand more than 95% of the time.
This makes it well worth it to open the door for extracting more value from your hand postdraw.

If you have a proper pat bluffing range you won't need to do it I guess

With Aces-full and KKKAA, you have the luxury of breaking when one or two opponents draw three and are last to act. I've limped every time with AAAxx and KKKAA from UTG whenever I thought there was some chance the SB would complete with a weak hand, especially if the table was tighter than average. The bad part of being UTG is that someone might play after you, but hopefully that will be with a raise. Unfortunately, the downside is if an opponent draws one, you have to pat and hope he/she improves.

From the BTN/CUT, I just open raise and don't break any boat because my pat bluffing frequency is close to optimal and I want to maximize the number of pat bluffing combinations from those spots ( or rather, my range of systemic pat bluffing hands is essentially as wide as can be without bluffing more than the GTO frequency ); I haven't extended this range except against a player that I feel folds too often versus a pat hand. OTOH, if a player doesn't have or hasn't worked out their pat bluffing range from the BTN, I can see breaking aces full or KKKAA from that spot versus one or both blinds that draw 3+ cards, especially if he/she has a fairly wide semibluffing range from the BTN and the blinds are not oblivious to how wide that semibluffing range is.

There's also a greater than 1% chance that an opponent drawing three will make a boat+ and when that happens, you will usually regret not standing pat on a "nut boat".