Not allowing to change the controls in a 2017 games is a bit re-tarded

The Dev's have NEVER read nor responded is a single post in this forum. I don't think they read English so all this is a waste or time.

Which is why I sent them this email requesting it and also toggling the iris fadein/fadeout effect like you could in the 1983 version:

こんにちは
私はゲームコントローラのキーを再マップしたいと思います
I would like to remap game controller keys.

左のバンパーを左のトリガーに、右のバンパーを右のトリガーに再マップしようとしています。
I'm trying to remap left bumper to left trigger and right bumper to right trigger.

CTRL-Zアイリスフェードイン/フェードアウトエフェクトを切り替えます。
CTRL-Z Toggles the iris fadein/fadeout effect.

クラシックロードランナーは、フェードアウト効果をフェードインします。 これを起こさせることができますか？ ありがとう！
Classic Lode Runner let you toggle the fade in fade out effect. Can you make this happen? Thanks!

Did they reply?

Here's the response I received from Tozai hopefully this might be helpful to anyone using a steam controller and the manual for the keyboard key assignments:
Thank you for playing Lode Runner Legacy.

Unfortunately Lode Runner Legacy does not support custom key assign, nor some of the function related to the effects you have mentioned below.

For the game controller keys remap, you can find the tips here;

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=563774882

Also please find the key assignment for Lode Runner Legacy here;

https://steamhost.cn/cdn_akamai_steamstatic_com/steam/apps/628660/manuals/LotusSeven_Operating_Manual(EN).pdf?t=1507274898

It’s in page 3 and 4.

It's easy to customise controls in Big Picture Mode. No need to stay there when you play.

Yea, but in my experience, it they have functions hard coded, the Steam controller mapping will not override them, just add to them. Unless the game includes a "disable gamepad" which this game doesn't.
I get around this by assigning a deactivate gamepad in steam which clears it them use Xpadder to remap it.

Here is how I do it.
Plug in your controller.
Right click on your game in Library view.
Select Edit Steam Controller Configuration.
Select Browse Configs.
Look around for "Steam Controller Configs - Desktop Disabled". Select it.
Backout. This will clear the gamepad settings in the game you selected. Now use Xpadder or semilar to remap your controller if you want that.