Arm Splints: Good or Bad???

Emma's arms are the most spastic part of her body, above her legs and all else. She has trouble with bearing weight on them, reaching, crawling on hands and knees. She tends to keep the flexed toward herself, even though we do ROM and exercise on them daily. So, this limits her in many ways. She cannot feed herself or get herself to her walker from the floor. It literally makes her completely dependent in spite of all her accomplishments. We are still working on getting onto her hands and knees and bearing weigh on her arms. She likes to sit on her heels, so it works out okay. She isn't a huge W sitter, but a big heel sitter. When trying to help her, she will pull her arms back up. With this said, could arm splints or immobilizers help? Are there any good ones with velcro that are easy to get on?? I have tried the Uria splints that inflate, and they are a pain in the butt. Are there any suggestion that you can give me to help get some strength into her arms? This is important for her to get more independence. Thanks!