So, you can, right now, add a new UIX for it for "more applications...".
I don't understand if this issue is about:
Adding a UIX for "more applications..."
A proposal to change the L&F of the UIXP implementation (I don't understand your rationale for changing what exists but this needs to be explained in a proposal, see below).
In both cases this requires a proposal on the forum to decide about it.
It's probably about both but they're not the same thing so this might need 2 proposals.
This message was sent by Atlassian Jira (v9.3.0#930000-sha1:287aeb6)
If image attachments aren't displayed, see this article.