contributing: add some notes about code

CONTRIBUTING.md

@@ -1,8 +1,19 @@
 # Contributing
 
+- Please, please, please, make multiple PRs if you have many features/fixes, and don't shove your personal changes along with the PR, including changed defaults
 - I can accept features I do not personally want, but in that case I will ask you to make it configurable/optionally loaded
-- If you want to add new stuff, it's a good idea to ask me first to not waste your work
-- Please make multiple PRs if you have many features/fixes
+- If you want to start working on something big to contribute, it might be a good idea to ask first to not waste your effort (but if you've already done it for yourself, it doesn't hurt to submit)
+
+# Code details
+
+## Dynamic loading
+
+- If something's not always necessary, especially when guarded by a config option to enable/disable, put it in a `Loader`. One tip with `Loader`s is sometimes you will need to declare positioning properties (like `anchors`) in the `Loader`, not the `sourceComponent`
+
+## Practical concerns
+
+- Make sure what you add does not require significant resources for a minor purpose or harm usability just for the sake of looking nice. The dotfiles must remain practical for daily driving.
+- If there is something really fancy and impractical anyway, add a config option for it and make sure it's disabled by default. 
 
 # Setting up