You can edit the default keybinds from the game files directly (as it's not yet integrated into the game). The file in question is "shortcuts.xml" found here:

C:\Program Files (x86)\Steam\SteamApps\common\Mashinky\media\config

Your game files may be in slightly different locations depending on how you save games in Steam. You can find them by right clicking the game in your Library, go to properties, go to the Local Files tab, and then click browse local files.

For those unfamiliar with XML they are basically text files that you can edit with the standard notepad or (more easily) with Notepad++. Notepad++ can be obtained for free from here: https://notepad-plus-plus.org/ but is not necessary for the purposes of this guide.

The XML file's contents look this when editing it with Notepad++:

WARNING: It is best practice to SAVE YOUR GAME FILES before making edits to them. Modifying the XML files can have unintended effects and crash your game if done incorrectly. Whenever making edits, I suggest saving clean, unedited versions of the files somewhere safe.

To change a shortcut key, simply change the key combination that is within the double quotes after 'keycode:'.

Example of changing the keybind of bulldoze to "B".
<Shortcut keycode="B" flags="construction_mode" gui_id="GUI_DYNAMIT" gui_id_param="GUI_MODIFYTERRAIN" />

Another example, P for Pause:


This will also automatically update the tooltip within the game: