"It won't do high res injector scaling" LOL, what the hell is that?
Tfrasca, sequential is heavily overrated. If you tune the injection timing it can produce a preferred result, depending on your preference, but if not timing-tuned then you might not get what you want.
On the flip side, if you have randomly timed (but timed, not oddball, not sure if MS does this) semi sequential injection, AKA bank/batch of 2 twice per cycle, then you get some fresh fuel mist and some vapour off the hot valves, and you get smoothness by default.
The biggest genuine reason to run sequential injection is having huge injectors where doing two pulses per cycle really hurts your real world error size.
Also, make sure you use something with the modern VR circuit, the stuff in old microsquirts was the same as the V3 board (ms1/ms2, what terrible naming) and is pretty much useless. The modern circuit (as used in all of my projects) is automatic and if configured correctly on the PCB pretty much perfect for any scenario.
Data point for you: I've been running semi sequential and pseudo wasted spark (4 Toyota COPs) on my B234F swapped 240 sedan for months now. Coils have held up to firing twice, once into a near-dead-short (highly ionised exhaust gas) fine despite only taking a guess at the dwell.
If a new style MicroSquirt has the new style VR, f*** the haters, and do what you want. I assume Deka 60s are 60lb, about 700cc/min, if so, you'll be okay at idle firing them twice, or even firing them once in a crappy pattern (can give an uneven idle due to different effective mixture from fresh fuel in some cyls and evaporated vapour in others, but won't wander and have error like the semi setup can).
As much as I hate all of those products for a thousand solid reasons, if you know what you're doing you can get good consistent results from the junk and enjoy your car for less dollars down. It won't be a redo scenario unless you do something dumb.