I was thinking the limit was more like 100 characters.
In any case, I use Notepad a lot for quick little editing things. For example, open a Notepad window, type a little bit of stuff, and then copy and paste it into somewhere in RM. Or copy and paste a little text from RM into Notepad, do a little editing there, and copy and paste it back into RM. That way, the window I'm working in is free standing from RM and I can make the font size etc. anything I want. I have Notepad pinned to my Taskbar at the bottom of the Windows screen, and it starts up almost instantaneously. I just close it out when I'm done. And if I do a Cut and Paste when I close it out, I don't even have to tell it that there is nothing that needs to be saved. It just closes immediately without giving me any obnoxious backtalk. I usually do Cut and Paste with CTL-X and CTL-V.
Notepad is a really simple and really dumb editor - no spellcheck, etc. - but it does very nicely for these simple kinds of tasks. I also use both Notepad++ and Microsoft Word sometimes in a similar fashion when the job is a little bigger and I need formatting or spellchecking or some such.
It's not just RM. There are several other programs where I use similar techniques, where the editing window is too little or the text is too little etc. Or as another example, there are a few cases where I have very long passwords and I will type them into a temporary Notepad window so that I can see them to be sure they are right, and then I will copy and paste them into wherever they really need to go. Passwords are usually masked as you type them in. I suppose masking makes sense on a public computer, but I'm not sure it's all that useful on my computer at home, and for long passwords it's a real pain. So Notepad to the rescue.