I once suggested some of these ideas before to machinemuse, but they got shot down quite hard. it's to have a central page in the tinkering table that shows summarized information about your suit. information like how much weight you've in total, and how much weight each part has. the same for how much energy the suit has, and each part has and as a big addition, having several modes for your powersuit. with modes I mean settings you can switch between. as an example, instead of having to keybind your modules to several keys, you could create a profile that has the modules you want switched on or off, and you can keybind that profile. to take it a step further, you could change settings of the modules in the profiles. so for example profile 1 would have a pickaxe module with x8 speed multiplier, and profile 2 would have a speed multiplier of x8. with this you can also change your powersuit's appearance with the profiles. so for example profile 1 would be a mining profile with a blue appearance, with a low armor and attack, but having a jump boost and fast pickaxe/axe/shovel, and profile 2 would be an attack mode, with fast speed, a red appearance, high armor and high attack. this would solve alot of headache for me for having to remember all the keybinds, or constantly having to change around modules and keybinds.
to make the editing of the appearance of the powersuit more easily, you could save the configuration of a powersuit to a file on your computer with a name. you could share these files with others and they can download and place them inside a MPS folder in the minecraft folder. they could then go ingame, and select the profile names of the downloaded files. this is to make it easier for people to use their favorite powersuit appearance, but it'd also be nice for people who're bad at making a good looking powersuit appearance. and ofcourse it'd go really well with the profile suggestion, you could have totally different looking powersuits with each profile.
I also had the suggestion of adding some voice clips to the powersuits, that activate during certain circumstances. you could ofcourse choose between a male and a female version, and they could tell things like when the power goes below a certain level, when the suit gets too hot, when a certain module gets toggled... things like that. this would be like Jarvis in Iron Man.
and another suggestion was when you'd shoot the plasma cannon into a lake, you'd have a certain percentage of chance of fish dropping for a short amount of time so you can pick them up. the plasma cannon would temporarily stun the fish in the water, and if you're quick enough you could catch them. and a last suggestion I did was a grapling hook module for the powersuit's powerglove. it'd be a cheap module for early game that you can shoot up walls by right-clicking, and when you left click the powerglove you get pulled towards the grapling hook you shot. this would be a cheap way of getting up hills or across large holes early game. you could also use it for example to pull mobs towards you, so basically it's somewhat like a fishing rod, which you can use to pull mobs towards you, or in reverse pull yourself towards the grapling hook. I also suggested that when you shoot the grapling hook, the claw part of the powerglove could have the animation of it being shot away, and you see a rope hanging between the claw and the glove.