Hey!
I think, a lot of people may wonder, what is the truth in the topic of the non functional stuffz in 3.01 under Devhook.
I have made my own copy, and tested the mentioned things, excluding the Remote Play, and PS1 emulation, because I don't have a PS3, nor 500$ to buy one. :)
I have a 2.71SE-C PSP (1003), Used X-Flash to get the F1 files, and Devhook to flash the 3.01 flash1 to my PSP's NAND chip.
Everything is just working fine, the only problem, I know about is that if you don't push Hold/Exit Devhook/Yes, and reboot your PSP to your "official", not emulated firmware, it screws your settings, but don't worry, you just have to push the O, and reset your machine. The clocking, and UMD emulating are also working, but there is no No-UMD mode, as I know. But the fast fast forward, and visualizer function in MP3 player, and working browser may make you not minding about this little thing.
Hope you to have fun with these informations, I will make a video soon, to proove it, for all of those, who still can't believe the magic, of SE-C, and using 1.5.. xD

ps: If anyone has tested the mentioned PS3 connectivity functions, mail me, and I will Update my post.