That's good! Thank you!
PgUp and PgDn are easy to implement. I could also do filtering, but I have a practical problem there: suppose you enter a text. As you type, the list should be changed. Now, if you typed a complete file name, only that file should be shown below. Well, you currently can click on files in the file list and the name will populate in the entry box and you can continue to scroll and click on other file names, but if I do the automated filtering, this will no longer be possible, since clicking on one file name will take that to the entry box, thus filtering and leaving only that file in the list. I have to find an alternative, another idea, so that I can do the filtering without that interfering with the current working of the list.
I'll probably also enable F11 and F12 for GNU/Linux, even though they're not necessary, since SHIFT+F1 and SHIFT+F2 work well and you also have "T".
A clipboard would be a major addition to the editor, but I agree that it's a very important one. In order to get that done, I realised I had to change the way graphics are being handled. Because I saw this was probably going to also solve the problem with the slow start-up in DOS, I've already made that graphic system change. The loading speed in DOS has only increased a little, which makes me think the actual problem has to do with DPMI initialisation when I try to allocate memory for the first time, but I'm not sure. Anyway, the change now allows for a "third layer", which I will use for the clipboard selection system. It will also make it possible to improve the graphic quality. This is going to take some time.
I think the first thing I will do is get rid of the bugs and get the first non-beta release. Then, I will be able to continue with the new features.