I know this should never really come up under normal circumstances, but I have a very specific project at work at the moment and it requires a lot of local variables. I've run into an unusual problem as a result. I've run out of vertical space on my monitor and the list of registered local variables does not scroll, this makes it impossible to select certain variables. Fortunately I have two monitors at work and one is a larger resolution, so I just move the ASE window over to my other monitor and select the variable, however that one is going to run out of space soon, too. I also wish the variable selector could be sorted alphabetically.
Currently the only workaround I know of is to name a variable starting with an unused first letter (like Q, or something uncommon), that way when you press the letter it'll just get selected, once you have one 'get local var' with the right variable you can then just duplicate them and rename it to something useful.
Hopefully this would be an easy fix to make. Though ideally I never find myself in this situation again.
We've tested on Unity 2017.3.0f3 with the latest ASE version and the issue is not present on our side, we assume it's an Unity related issue as this menu is simply issuing Unity calls that create a native Windows menu.
Hopefully we can make this menu scroll-able, I've registered your feedback and our developers will look into it as soon as possible, apologies for the inconvenience.
Please let me know if you have any further questions, thanks!