I find that using mini-keyboard with Text Plus works great.

Looks like mini-keyboard is still on sale at PDATopSoft for $13.65 (30% discount from the regular price of $19.95). I took advantage of it a while ago and love it!

http://palm.pdatopsoft.com/PalmOS/Mini-Keyboard

Don't know how much longer the sale is on, so if you like it, buy it now.