A very convenient feature would be to enable users to pin their favorite xApps to the drawer at the bottom of the XUMM GUI. The quick selection drawer could remain a small subset of xApps (4-6) as it is now, except the user chooses which ones will appear in that area. The full list of xApps in the "More xApps" section should also show the default xApps, plus any additional ones that have been pinned by the user. The user should also be able to arrange the icons in their desired order.

This will build on the new (and great) xApp History feature that was recently introduced by taking it a step further, and include beta xApps as well.

Bonus related suggestion: This one is not as important IMO, but it would be cool to scroll sideways through your xApps within the pop-up drawer at the bottom of the screen, instead of having a static number of icons. This would save taps and reduce (or even eliminate) the need to open the full "More xApps" screen.