By default, the drawbridge block is 'off' and needs a redstone signal in order to place the blocks. Could there be some sort of button to invert the block's power state?

Like... for example... if you turn it's power state to 'on'... it'll place the blocks as if it had a redstone signal, however if you give it a redstone signal while it's 'on'... it'll turns off and put away the blocks.

I guess you could call it a 'Inverted Drawbridge Block' in a way.

Feature tested and committed! Will be included in the next version

Thanks for the enhancement
Cheers
~MrTroble

Release is now on curseforge

This is a good idea. I will add it asap!

Cheers
~MrTroble

Is it better to make a whole new block or just an option in the tileentity (gui) block to invert it?

I would make a Button.

At first I was going to suggest a new block but then thought that when you put the blocks inside it... it'll auto-place them right away. You can delay it via the tick slider but figure the gui button toggle might be better.

It's kinda like the Resonant Servo block from Thermal Dynamics where it has 3 states of redstone control, Ignored, Low & High. Drawbridge button toggle would be Low & High which Low is ON and turns off if powered while High is OFF which turns on if powered.